JANUARY 1976 75 CENTS A HARCOURT BRACE JOVANOVICH ... · diator (vertica clement). Heavy-duty U...

JANUARY 1976 75 CENTS A HARCOURT BRACE JOVANOVICH PUBLICATION

S

S

CI

ELECTRONICTECHNICIAN/DEALERWORLD'S LARGEST TV -RADIO SERVICE & SALES CIRCULATION

CARRY IN RATESMINIMUM LABOR FOR

FIRST 15 MINUTESOL $ 12.50& $ 11.95

TRANS. $ 12.50EST. MIN. s 11.55

MAX. =1695$6.00 EACH ADO'T 20 MIN.

MAINTENANCE AGREEMENT

BS, 01.2ND. YEAR BPI. $14.95 $33.952ND. YEAR F.C. $59.9521 MO. $34.95 $69.95

SETS RELEASEDONLY

VV ITH CLAIM CHECK

Annual Subject Reference Index

Carry -In TV Servicing-Passing Fad Or Established Trend?

About the time you'vepicked up or all thelatest in tuner design,some clever engineersneaks in a new twist.That's where PTS comesin . . . a tuner repairservice that's always a dayahead of design changes.And now PTS has entered themodule field, providing same -dayservice for repair of Zenith, RCA,Quasar and GE modules. Moduleoverhaul carries a one year warranty.Only PTS-Bloomington handles module repair.Mail units direct to Bloomington or ask any PTSservice center to ship them for you. PTS-theworld's largest tuner repair service-has 36company -owned service centers in the U.S. and Canada.Module Overhaul - $5.95 to $12.50.

OEM111111111111111

INIIMS11111111011111111M1111180111111

I 1110

ab PRECISION

aERVICE

BLOOMINGTON MODULE CENTER / P.O. BOX 272 / BLOOMINGTON, IN 47401

Consullt the white pages of your telephone directory for the address and number of your neorest PTS Service Center.General Headquarters: Bloomington, IN - Birmingham - Phoenix - Los Angeles - San Diego - Sacramento - Arvada (CO) -Jacksonville - Tampa - Miami - Indianapolis - Kansas City (KS) - Metairie (LA) - Silver Spring (MD) - Boston -

Springfield (MA) - Detroit - Minneapolis - St. Louis - E. Paterson (NJ) - Buffalo (NY) - Charlotte (NC) - Cincinnati -Columbus (OH) - Cleveland - Oklahoma City - Portland (OR) - Pittsburgh - Philadelphia - Montreal - Memphis - Houston -Longview (TX) - Norfolk - Seattle - Milwaukee.

...for more details circle 102 on Reader Service Card

la

"Breaker . . . Breaker ..

reak-through withBREAKER!

The New Freedom Line o' CB Mobile and Base Antennasand Accessories made in the U.S.A. for communications be-tween people.

A wide selection of "revolutionary" new CB High Efficiencycommunications antennas of superior strength, electronicallyand physically, fo- all the talk power your CB rig will deliver-coming and goilg in the 27 Megahertz frequency band.

Mobile Breaker antennas for cars, trucks, trailers, sportscars, station wagons, motorcycles, boats. Breaker base sta-tion antennas to communicate with mobiles and hand helds... all designed specifically for the outstanding transmissionand reception of CB signals.

The high quality and materials of the Breaker CB antennasand accessories assure you the maximum in performance formany years and at reasonable cost. Performance -testedBreaker CB antennas offer you these advantages plus more:

* Easily adjust for lowest VSWR* Long -life stainless steel and fiberglass whips* Highest quality coaxial cable with solderless connections* Innovative engineering designs* Packaged for quick, easy installation to get you on the air

fast, complete with cables and hardware

All Breaker antennas are American made in Arlington,Texas. In keeping with the tradition of the Bi-Centennial theyare proudly named after our revolutionary heroes and places.Red, white and blue are also the colors of Breaker. Chosenbecause we too are very proud of our heritage and contribu-tion to making exciting products for use by people com-municating with people. See and buy the Freedom line ofBreaker antennas and accessories at your nearest electronicdistributor. Look for the red, white and blue packaging.

*

WRITE FOR FREE CATALOG.

GEORGE WASHINGTONWest Coast Mirror MountDual Truck, RV Antennas

Model 10-200Weatber resistant dual 57"stainless steel whip anten-nas with static arrestor tips.Secure horizontal or verti-cal mounting to West Coastside view truck type mir-rors. Twin antennas co -phased for more directionalpower and easily adjustablefor fire tuning. Hermetical-ly sealed, white oversizedABS center load. Dual 18'low -loss coaxial phasingharnesses with solderlessconnectors and quick dis-connect PL -259 plugs. Com-plete with corrosion resis-tant mounting hardware.

frit I 41-11

INDEPENDENCEGutter Mount Antenna

Model 10-245Low -profile 21"stainless steelwhip antenra with s atic ar-restor and Ilex-matic shockspring. =its practically anyvehicle rain gutter. No inter-ference with door opening orpassenger exit Heavy-dutymolded clamp bracket insu-lates and supports antenna.Center loaded ABS load coilfor excellent transmission andreceotion. 14' coaxial cablewith solderless connector andquick -disconnect PL -259 plug.Complete w to corrosion re-sistant mounting harowere.

THE PATRIOTOmni-directic nal1/4 -Wave Base AntennaModel 11-101High in quality, perfor-mance and efficiency,low in cost. Fas three108" quarter wave tubu-lar alumir urn radialsplus a quarte--wave ra-diator (vertica clement).Heavy-duty U -clamp fitsmast up to 15/3a diam-eter. Built-in lightningprotectar. SO -239 styleconnector moult. Mateswith PL -259 p uc. Shuntloaded coil. Heavy dutyinsulated molded clampbracket. Easy t assem-ble and dis-assemble.Fixed construction.

PAUL REVERERoof Mount Antenna

Model 10-215Special -power-plus" 42" base-loaced roof mount with long -life stainless steel whip, ruggedstainless steel shock springand high -quality 16 -ft. shieldedcoax cable and solcerless con-necions for fast "on -the -air"installation. Named after thefamed communicator and heroof revolutionary era.

THE MINUTEMANTrunk Mount Antenna Model 10-233

Stu's:1y, durable, no -hole -equired intrunk of velic e. Soper 44" stainlesssteel whip, base loaded low -profile an-tenra w th sta nless shock absorbingspring chrome plated brass bell hous-ing, 18 -foot shielded coaxial cable andsoloe-less connections.

-)aker! 7 7

far more details circle 109 on Reader Service Card

CORPORATION

1-01 G -eat Southwest ParkwayArlington, Texas 76011

Only when you specify TM areyou sure of getting flybacksthat meet today's governmentsafety standards.It's true! If you specify the original OEM flybackinstead of a THORDARSON exact replacement,you risk getting a part identical to the one thatfailed ... a part that would be illegal in a newset built today.

Here's how THORDARSON MEISSNER makessure you don't get burned:

Every TM color flyback we make meetsnew set safety standards.

99% of THORDARSON replacements soldare exact replacements right down to the wir-ing color code ... no hassles with re -wiring orconfusing instructions.

TtloRDARsoNEstablished 1895

THORDARSON MEISSNER INC.A subsidiary of Components Corp. of AmericaElectronic Center Mount Carmel, IL 62863

Every TM flyback is designed for reliabilitynot production line price specifications.

Every TM part is quality made in the U.S....yet, almost always costs less than its ofteninferior OEM "equivalent."

TM never undercuts your business. Sincethe inception of the industry, we've given ourtotal support to America's independent partsdistributors and service dealers.

TM distributors stock in depth ... andTHORDARSON's unique Rush Order service forhard -to -get parts is available for fast factory -to -you shipments!

Ask your independent distributor (or write) fora free copy of the THORDARSON TV Replace-ment Guide.

Support your independent parts distributor... we do! NEDA Associate Member


2 / ELECTRONIC TECHNICIAN/DEALER, JANUARY 1976

J.W. PHIPPSEditor1 East First StreetDuluth, Minn. 55802(218) 727-8511

ALFRED A. MENEGUSPublisher757 Third AvenueNew York, N.Y. 10017(212) 754-4382

TOM GRENEYPublishing Director

JOSEPH ZAUHARManaging Editor

DEBI HARMERProduction Manager

BERNICE GEISERTProduction Supervisor

JOHN PASZAKGraphic Design

LILLIE PEARSONCirculation Fulfillment

GENE BAILEYManager, Reader Services

ROZ MARKHOUSEClassified Advertising Manager

CONTRIBUTING EDITORS

JOSEPH J. CARR

DAVID NORMAN

DISTRICT MANAGERS

DAVE HAGELIN43 East Ohio StreetChicago, III. 60611(312) 467-0670

CHUCK CUMMINGSAd Space South/West613 North O'ConnorIrving, Texas 75060(214) 253-8678

ROBERT UPTONTokyo, JapanC.P.O., Box 1717

ELECTRONICTECHNICIAN/DEALERJanuary 1976 VOLUME 98 NUMBER 1

THE COVER: Taken in the carry -in area of a large electronic service company in Chicago, the cover photo thismonth symbolizes the increase in carry -in TV servicing which is the subject of the Profitably Speaking article inthis issue.

BUSINESS MANAGEMENT/SHOP OPERATIONS12 Carry -In TV Servicing-Passing Fad Or Established Trend?

In this month's Profitably Speaking article, ET/D Editor J. Phipps presents EIAstatistics which indicate that table and portable models dominate the presentTV set population-a dominance which, if it is not happening already, probablywill make carry -in business the principal source of TV servicing income in thenear future.

HOME ENTERTAINEMENT ELECTRONICS14 GTE Sylvania & Philco Color TV 1976

Plug-in ICs, transistors and modules are three significant serviceabilityfeatures readily evident in GTE Sylvania and Philco 1976 color TV chassis.These and other features and circuits in this manufacturer's new color TV lineare analyzed this month by ET/D Managing Editor Joe Zauhar.

22 Color TV Module GuideA listing of modules used in color TV chassis. This month: General Electric.

COMMUNICATIONS ELECTRONICS26 Servicing CB Power Supplies

First of a series of articles in which ET/D Communications Editor David Normanexplains the operation of "representative" circuits in CB transceivers andpoints out typical failures and their symptoms.

28 Comm ChatCommunications Editor Dave Norman reviews the characteristics and uses ofthe most common segments of the RF spectrum.

VEHICULAR & OUTDOOR ELECTRONICS34 Recurring Failures In Car Radios

Car radio components and devices which seem to fail more frequently thanothers are pointed out by ET/D Vehicular Electronics Editor Joseph J. Carr.

39 Carr TalkVehicular Electronic Editor Joe Carr provides pointers on how to deal with "offbrand" car tape players.

40 ET/D 1975 SUBJECT REFERENCE INDEXAn alphabetized subject -to -issue listing of editorial topics and servicing tipspublished in ET/D during 1975.

DEPARTMENTS4 NEWS OF THE INDUSTRY

8 ELECTRONIC ASSOCIATION DIGEST

24 TECH DIGEST

30 TECHNICAL LITERATURE

32 TEST INSTRUMENT REPORT

43 NEW PRODUCTS

50 CLASSIFIED ADS

52 ADVERTISERS INDEX

55 READER SERVICE

57 TEKFAX

[ff A HARCOURT BRACE JOVANOVICH PUBLICATION 7/17 CE)

HARCOURT BRACE JOVANOVICH PUBLICATIONS. James Milholland, Jr., Chairman, Robert L. Edgell, President, Lars Fladmark,Senior Vice President, Richard Moeller. Treasurer, John G. Reynolds, Vice President, Thomas Greney, Vice President. EzraPincus, Vice President, Bruce B. Howat, Vice President, James Gherna, Vice President; Lois Sanders, Vice President.

ELECTRONIC TECHNICIAN/DEALER is published monthly by Harcourt Brace Jovanovich Publications. Corporate offices; 757Third Avenue, New York, New York 10017. Advertising offices: 43 East Ohio Street, Chicago, Illinois 60611 and 757 ThirdAvenue, New York, New York 10017. Editorial, Accounting, Advertising Production and Circulation offices: 1 East First Street,Duluth, Minnesota 55802. Subscription rate one year, $7; two years, $12; three years, $16 in the United States and Canada.Other countries: one year, $15; two years, $24; three years, $30. Single copies: 75 ¢ in the U.S. and Canada; all other countries:$2. Second Class postage paid at Duluth, Minnesota 55806 and at additional mailing offices. Copyright © 1976 by HarcourtBrace Jovanovich, Inc. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by anymeans, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, withoutpermission in writing from the publisher.

POSTMASTER: Send Form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth, Minnesota 55806.

JANUARY 1976, ELECTRONIC TECHNICIAN/DEALER / 3

NEWS OF THE INDUSTRY

Factory Installed Car CB Not Yet A Reality, But On Horizon

Although no U.S. auto maker is yet offering CB radio on an original equipment basis, arecent report in Television Digest implies that factory installed units are not far down theroad.

Says the report: "Ford and other auto firms are known to be discussing the feasibility ofoffering CB as original equipment with several CB makers, including E.F. Johnson andMotorola."

Ford is the only one of the four major auto makers who presently does not offer CB as adealer -installed option.

General Motors, says the report, has the broadest CB program and offers both Pearce -Simpson and E.F. Johnson units to GM dealers through the GM Parts Division. GM'sDelco Division, as yet, is not in the CB business, but, according to the report, a Delcospokesman acknowledged that Delco is "looking at designs to decide whether or not it isdesirable." The Delco spokesman, says the report, would not comment on reports thatDelco is developing its own in -dash CB/tape player combination unit.

Chrysler, at the time the Television Digest report was written, was in the process ofchoosing one of three CB bands-E.F. Johnson, Cobra or Kraco-which it will offer itsdealers through its Mopar service and replacements parts division.

American Motors, according to the report, presently offers its dealers a range of E.F.Johnson CB units.

E.F. Johnson, says the report, is also a big suppleir of CB parts to the truck industry,including Peterbuilt, Kenworth, Mack, White, International, GMC and Ford.

The Television Digest report also stated that, although Motorola is not yet committedto the CB market, Motorola President William Weis recently told security analysts inChicago that Motorola probably will enter the field.

RCA Now Remanufacturing Defective Color TV Modules

The RCA Distributor and Special Products Division in November announced that ithad begun factory repair of certain RCA color TV modules.

program, TV dealers and technicians can return certain out -or -warranty defective RCA color TV modules to "appointed RCA replacement parts dis-tributors" and receive from 50 cents to $2.00 credit for each module, depending on thetype and resale value of the module. The distributor, in turn, sends the defective moduleto RCA for remanufacture.

The remanufactured RCA color TV modules are returned to RCA replacement partsdistributors, for resale to dealers and technicians at the same prices as new units.Remanufactured modules are indentified as such by a label affixed to each unit and by animprinted notice on each carton.

According to RCA, the module remanufacturing program, which involves about 20types of modules employed in various RCA color TV chassis (excluding those in RCA'snew ColorTrak series), was inaugurated "to insure that reliable replacement moduleswill be available for continued servicing of RCA television receivers" and "is especiallyimportant with respect to older chassis designs in which some modules are currentlybeing phased out of production."

Describing the module remanufacturing process, an RCA spokesman said: "All mod-ules are screened by RCA before being remanufactured. Those which pass examinationare sent to the RCA factory in which they were originally manufactured. There theyundergo diagnosis and repair, including alignment of tuned circuits and temperaturecycling. If circuit improvements have taken place since original production, the requiredmodifications will be made during remanufacturing, to take advantage of technologicaladvances."

Other color TV manufacturers who have instituted module remanufacturing pro-grams include Sylvania, who remanufactures Philco modules, and Quasar, who remanu-factures both Motorola and Quasar modules.

Philco Finance Sold By Ford Motor Credit To ITT Financial

ITT Consumer Services Corporation and Ford Motor Credit Company have announcedthe completion of the sale of the wholesale finance receivables and certain other assets ofPhilco Finance Corporation to ITT Financial Corporation.

The assets acquired from Philco Finance will be employed by ITT Diversified CreditCorp., a wholly -owned subsidiary of ITT Financial Corporation, in the financing of 3,500dealers through 18 branches across the U.S.

Philco Finance, previously a wholly -owned subsidiary of Ford Motor Credit Company,had provided financing on home appliance inventories for the 3,500 dealers. BecauseAeronutronic Ford Corporation (formerly Philco-Ford Corporation) is no longer involved


in the consumer products business, except for refrigerator and freezer sales, there is nolonger a need for Philco Finance, which substantially ceases operation with the comple-tion of the sale.

Sarnoff Resigns From RCA Corporation

Robert W. Sarnoff, who for ten years served as president and then as chairman of theRCA Corporation, on December 31 resigned as chairman and a member of the board ofdirectors of that company.

Anthony L. Conrad, who became president of RCA on August 1, 1971, has beendesignated both president and chief executive officer of RCA Corporation by the RCAboard of directors. Conrad, whose career with RCA spans a quarter of a century, waspresident of the RCA Service Company for eight years prior to his appointment to theRCA corporate staff in August, 1968. Conrad joined the RCA Service Company in 1946following his discharge from the U.S. Army Signal Corps.

Slumping TV Sales and Continued Japanese Competition Might Force Sears -SupplierWarwick Out of TV Business

The chairman of the Whirlpool Corporation, John Platts, in an interview publishedrecently in the Wall Street Journal, stated that the combination of continued declines incolor TV sales and increased pricing competition from Japanese TV manufacturers couldeventually force Warwick Electronics Corporation out of the TV manufacturing busi-ness.

Warwick, of which 57 percent is owned by Whirlpool and 25 percent by Sears, Roebuckand Co., is a major supplier of TV to Sears.

Platt, who is also chairman of Warwick, said that, although Warwick would notabandon the TV business in the near future, if the current combination of slumping TVsales and increased foreign pricing competition continue "we will have to reassess ourposition."

Warwick early last year stopped manufacturing 17- and 15 -inch color TV for Searsbecause, as Platts stated, "we were not competitive with the Japanese."

To recover costs and make a reasonable profit, said Platts, 19 -inch color TV receiversshould be retailed for about $499. However, foreign competition has forced down theretail price of such sets to the $369-to$399 range, and lower. (A recent Television Digestreport stated that in early November Sears was advertising a Japanese -made color TVset in the New York area for $269.)

Western Appliance Electronic Dealer Show Scheduled For July 11-13 In Los Angeles

PREVIEW/77, which is billed as the first large-scale, West Coast dealer trade show forappliance, TV, audio and personal communications products, is scheduled for July 11-13at the Hyatt International Hotel, Los Angeles Airport.

CAN Now Serving 15.3% Of U.S. TV HomesCommunity antenna television (CATV) systems were serving 15.3 percent of the

nation's 70.5 million TV homes at the end of last year, according to estimates by Televi-sion Digest.

At year's end, says Television Digest, there were about 3,450 CATV systems operatingin the U.S., compared to 3,366 at the end of 1974.

RCA Abandons Magnetic Tape Home Video Tape Player/Recorder

RCA has discontinued further development of its Mag Tape Selectra Vision home videotape player/recorder and will channel its technical and financial resources into thedevelopment and marketing of its Selectra Vision disc -type home video player, accordingto a report by Television Digest.

The reason given by RCA for dropping its Mag Tape system is that the "retail pricewould have exceeded the range necessary to make it a viable consumer product."

Proposed Aerosol Ban Based On "Unproved Theo: Says Electronics Aerosol Producer

"The claim that aerosols pollute the atmosphere is an unproved theory with noevidence to back it up."

This is the opening statement in a "position paper" recently released by Al Friedman,


president of Chemtronics Inc., a major producer of aerosols for the electronics industry.The aerosol controversy was started by Drs. Rowland and Molina, two University of

California scientists. Their theory is that fluorocarbons used as aerosol propellants getinto the earth's stratosphere (about 25 miles above the surface) where they destroy ozone.Because the ozone layer protects us from ultra -violet rays, a substantial decrease in theamount of ozone in the stratosphere would lead to an increase in the incidence of skincancer.

Friedman contends that there is "absolutely no reason for aerosol products to bebanned at this time."

Reaction by other scientists to the Rowland/Moline theory that fluorocarbons depletethe ozone layer, says Friedman, range from complete agreement, to characterizations ofthe hypothesis as "utter nonsense."

For example, says Friedman, leading British meteoroligist Dr. Richard S. Scorer hasstated: "The whole issue has been blown up out of all proportion, and the subsequentoutcry is an overreaction to a scientifically questionable theory."

On the other hand, points out Friedman, Dr. Michael McElroy of Howard has taken theposition that "the burden of proof is on those who challenge the theories. We don't have toprove it is right. Somebody has to prove it is wrong."

This same attitude, says Friedman, was adopted by the states of New York and Oregon,who have passed legislation that will ban aerosol fluorocarbons in the future unless it isproven that they do not destroy the ozone layer.

According to Friedman, such proof is virtually impossible. "You cannot disprove anegative," he said. "The less evidence there is to indict fluorcarbons, the harder it is toprove they are innocent."

The only hard evidence pertinent to the controversy, says Friedman, has come fromDrs. London and Kelley of the University of Colorado. "Careful measurements made bythese scientists indicate that from 1957 through 1970, the ozone layer over the NorthernHemisphere has actually increased by 7 percent."

"Other scientists have shown that nitric acid, not chlorine, is the dominant factorgoverning ozone layers," contends Friedman, "And 50 to 70 per cent of ozone destructionis caused by combination with nitric oxide, according to Dr. Harold Johnson of theUniversity of California at Berkley."

According to Friedman, alternative propellants are presently available for most, butnot all, electronic chemicals.

Dynascan To Insure And Prepay All Cobra CB Radio Shipments

Dynascan Corporation, manufacturer and marketer of Cobra CB radios, has an-nounced that it is now providing full insurance protection for all of its Cobra shipmentsand, in addition, is prepaying all freight charges so that distributors and dealers will beable to receive Cobra products "with a minimum of paper -work and a maximum ofsafety."

The reasons behind this new policy, according to Carl Korn, president of Dynascan,"stem from the limited liability assumed under the regulations of the Motor FreightCarriers Association, and the fact that CB equipment has become a favorite target fortheft."

"Standard liability for freight carriers is based on weight," says Korn, "with $5.00 perpound as the maximum claim. However, for expensive, light -weight products, such as CBradios, this limit falls far short of actual value."

PTS Opens New TV Tuner Service Center In Los Angeles

PTS Electronics, Inc., an Indiana -based TV tuner service company, has opened a newrepair facility at 4184 Pacific Way, Los Angeles, California 90023.

Magnavox Producing CB For E.F. Johnson

Magnavox reportedly has contracted to manufacture 100,000 mobile CB radios for E.F.Johnson,a Minnesota -based producer and marketer of communications equipment.

The Magnavox -produced CB units will be marketed by E.F. Johnson under its Mes-senger brand name. The first 8,000 units reportedly will be delivered to E.F.'Johnson byyear's end.

The terms of the Magnavox/E.F. Johnson private label contract reportedly precludesthe possibility of Magnavox moving into the CB market with its own product or brand.

RCA Executive Says 45% Of Color TV Sales Are Replacements

Jack K. Santer, Division Vice President, Marketing, RCA Consumer Electronics, in aspeech to TV servicers in Indianapolis on Oct. 21, said that 45 percent of color TVreceivers sold now are replacements for old color receivers; 30 percent are purchased byfirst-time color TV buyers; 20 percent are purchased for use as second or third sets; and 5percent are purchased for institutional use (hotels, motels, etc.).

6 I ELECTRONIC TECHNICIAN/DEALER. JANUARY 1976

GTE Sylvania, Electronic Components Group, 100 First Avenue, Waltham, MA. 02154

Now you can test new 35kV chassiswith your 22kV test jig.

Introducing the CK2000regulator.

It protects your test jig'spicture tube against arcing.

It connects quickly topractically any jig withoutmodification.

Secret of the CK2000is a special varistor thattakes any anodevoltage from

22 to 35kV and converts it to 22kVfor your test jig. Voltages below 22kVsimply don't activate the varistor.

Best of all, our CK2000 costs onlyabout a quarter as much as many newtest jigs.

Who's afraid of 35kV? With our newCK2000 regulator, there's probably nota TV set in the world that can scare you.

See your Sylvania distributor.We're helping you make it.

SYLVAN IA


ELECTRONICASSOCIATION DIGEST

NESDA 1976 Annual Convention

The National Electronics Service Dealers Association(NESDA) has announced that its 1976 annual conventionwill be held in the San Antonio Convention Center, SanAntonio, Texas, August 13-17.

Hosting this year's NESDA annual convention is theTexas Electronics Association (TEA), which is expected tohold its annual state convention in conjunction with theNESDA convention.

Included among the many events already scheduled forthe convention is the NESDA Open Annual Golf Tourney,which this year will be sponsored by ElectronicTechnician/Dealer magazine.

For more information about the 1976 NESDA annualconvention contact Dick Glass, CET, NESDA ExecutiveVice President, 1715 Expo Lane, Indianapolis, IN 46224(phone 317-241-8160).

EIA Consumer Electronics InstructorsWorkshop Feb. 9-11

The Service Committee of the Electronic Industries As-sociation's Consumer Electronics Group (EIA/CEG) willconduct an instructor workshop February 9-11 at Appala-chian State University, Boone, North Carolina.

The purpose of the 30 -hour-long instructor workshop isto update college and university vocational instructors onthe latest electronic technical developments and "hands-on" teaching techniques of the industry.

The workshop will be divided into three sessions: audio,

ORIGINALANTENNA AND

KIT =1

Consists of 4 colorand B&W antennaused in most SonyTV sets.

$43.00 Total

List Price

Your Cost-$29.95

SONY TVKNOB KITS

KIT -=2

Consists of 14 color

and B&W VHF chan-

nel selector knobs

used in most Sony

TV sets.

$26.20 Total

List Price

Your Cost-$18.95

Add $1.00 per kit shipping charge plus 8% NYCtax. Certified check or money order only. Allowtwo weeks for delivery.

UNITED TELETRONICS PARTS CORP.

3860 TENTH AVENUE (207 ST.)NEW YORK, N.Y. 10034

AUTHORIZED SONY PARTS DISTRIBUTOR

television, and methods. Each session will be taught byqualified industry representatives who are familiar withthe industry's latest technical developments in his field.

The college and university instructors who complete theworkshop will then teach at CEG's 1976 summer semi-nars, which are attended by high school vocational instruc-tors from across the country.

Approximately 20,000 high school students are enrolledannually in vocational programs which will eventuallylead to a career in consumer electronics servicing.

The EIA's Consumer Electronics Group also has pre-pared for teachers of electronics courses a new handbookwhich lists electronic training aids.

The 225 -page Electronics Multimedia Handbook warproduced under the Association's Service Technician De-velopment Program.

Listed in the handbook are the prices of the trainingmaterials and the location from where they may be pur-chased. Some of the items which are in the comprehensivelisting include: Super 8MM and 16MM films, film loops,video tapes, filmstrips, cassette tapes, transparencies andcharts.

On an introductory basis, the book is still being madeavailable free -of -charge to vocational instructors by writ-ing to:

EIA/Consumer Electronics Group2001 Eye Street, N.W.Washington, D.C. 20006The EIA Electronics Multimedia Handbook was edited

by Dr. Irving W. Larson and will be updated periodically aspart of the CEG Service Technician Development Program.

IESA Member Appointed To IndianaService Examiners Board

Frank J. Teskey, CET, owner/operator of Teskey's TVCenter, Indianapolis, Indiana, and a member of the In-diana Electronic Service ap-pointed by Indiana Governor Otis Bowen to that state'sBoard of Television and Radio Service Examiners, a five-

member panel which supervises the regulation of homeentertainment electronic technicians and electronic ser-vice businesses in that state.NATESA Secretary General Dies

Leo P. Shumavon, Secretary General of the NationalAlliance of Television & Electronic Service Associationsand two-time president of that association, died in St.Petersburg, Florida, on November 18.

Mr. Shumavon, who for many years had owned and oper-ated an electronic service business in Dorchester, Mas-sachusetts, retired and moved to St. Petersburg sevenyears ago. In addition to performing in many positions andfunctions in NATESA, Mr. Shumavon also had been aleader in the Florida Electronics Service Association sincemoving to that state and has been honored many times forhis work in local, state, regional and national electronicservice association.

Colorado Elects New Officers

The Colorado Professional Electronics Association re-cently elected the following new officers: Robert Kavan,Denver, president; Leo Hofelich, Colorado Springs, vicepresident; Tom Thomas, Pueblo, secretary; and HaroldHollis, Denver, treasurer.

MOVING?

Be sure to let us know your new address. Pleaseenclose a complete address label from one of ourrecent issues.



PROFITABLYSPEAKING

With J.W. Phipps

Carry -In Servicing-Passing Fad Or

Established Trend

The majority of home enter-tainment electronic servicers towhom I've talked in the past yearsay that carry -in TV servicing ison the increase and the demandfor in -home servicing is slowly de-clining.

Whether or not this is a perma-nent, nationwide trend, andwhether or not it is causing, or willcause, a net loss or net gain in TVservice profits, is still hard to say.

Some servicers who are ex-periencing increased carry -inbusiness attribute it solely to"consumer concern about presentand future economic conditions"and believe that as soon as theeconomy shows a steady im-provement consumers will regaintheir confidence and once againwill be more interested in the con-venience of in -home servicingthan in any savings they might

TABLE 1

Total TV Sales to Dealers1965-1974

(Monochrome & colorcombined)

TYPE UNITS % OF TOTAL

Table/Portable 86,008,000 70.5%Console/Combo 35,968,000 29.5%Total 121,976,000

Source: EIA Marketing Services Dept.

realize from carry -in servicing.Other TV servicers, particu-

larly those who also sell TV re-ceivers, view the increase incarry -in volume as a permanenttrend resulting from three princi-pal factors: 1) Increasingly largerpercentages of the sets sold in re-cent years have been table andportable models which, because ofsize and weight reductions, are be-coming increasingly easier forconsumers to lift and transport; 2)consumer psychological condition-ing to carry -in service as a resultof manufacturers' carry -in war-ranty policies on portable andtable models; and 3) consumerpsychological conditioning tocarry -in service as a result of thedo-it-yourself trend, which in thepast two years or so has been rein-forced by consumers' need forbudget tightening-a conditionthat most consumers are ex-periencing as a result of the com-bined effects of inflation and re-cession.

Statistics on TV sales to dealersduring the ten-year period 1965-1974, compiled and published bythe Marketing Services Depart-ment of the Electronic IndustriesAssociation (EIA), not only sub-stantiate the contention that totalsales of table and portable modelsin the past ten years have ex-ceeded those of console and combounits, but also show that table andportable models have predomi-nated by a factor of almost three toone. As revealed by Table 1, of thetotal of 121,976,000 TV receiverssold to dealers during this period,awhopping 70.5 percent were tableor portable models.

As shown by Table 2, which is amore detailed breakout of theratio of table and portable to con-sole and combo models in mono-chrome and color TV sales duringthe ten-year period 1965-1974,the 60,498,000 color TV sets soldduring this period were almostevenly split between the two gen-eral categories of model types,with 49.9 percent being table orportable models and 50.1 percentbeing console or combo models. Ofthe 61,748,000 monochrome TVreceivers sold during this period,over 90 percent were table or port-able models.

Table 3, which is a yearlybreakout of the types of mono-chrome and color TV receivers

sold to dealers during the five-year period from 1970 to 1974,clearly reveals that the predomi-nance of table and portable modelsin TV sales is a well establishedtrend and that, although Table 2shows that total color TV salesduring the period 1965-1974 werealmost evenly split between thetable/portable and console/combocategories, table and portablemodels actually began to domi-nate color TV sales in 1971, and bythe end of 1974 were accountingfor 67.7 percent of total annualcolor TV sales to dealers. (Al-though not directly revealed inTable 3, by 1974 annual sales ofcolor TV were exceeding those ofmonochrome, and accounted for56.9 percent of the total TV salesthat year.)

Despite the fact that a statisti-cal breakout of TV sales during.1975 was not yet available at presstime, TV industry sources whom Ihave questioned say that the gen-eral trends revealed in Table 3undoubtedly continued in 1975.

To relate the preceding statis-tics to the present TV set popula-tion, I have attempted to deter-mine what percentage of the pres-ent TV set population was pro-duced during the period 1965-1974 (to which the precedingsales -to -dealers statistics apply).According to data published byEIA's Marketing Services Dept.,there were an estimated 70.6 mil-lion TV receivers in use as of 1965.Adding to this figure the 122 mil-lion sets sold to dealers during theperiod 1965-1974, produces a totalof 192.6 million TV receivers, fromwhich must be subtracted the totalnumber of TV receivers estimatedto have been scrapped during theperiod. (According to GTE Syl-vania's Marketing ResearchDept., an estimated average of 7.4million TV receivers werescrapped each year during theperiod 1965-1973. Based on thisscrappage estimate, approxi-mately 74 million TV receiverswere scrapped between 1965 and1974.) Subtracting the 74 millionscrapped receivers from the previ-ously computed figure of 192.6million, leaves 118.6 million re-ceivers in use as of the end of1974-slightly less than the total122 million TV receivers sold todealers during the ten-year periodending in 1974. This indicates


TABLE 2Total TV Sales To Dealers 1965-1974

(By Type)

TYPE

MONOCHROME

UNITS % OF TYPE

Table/Portable 55,805,000 90.8%Console/Combo 5,673,000 9.2%Total Monochrome 61,478,000

TYPE

Table/PortableConsole/ComboTotal Color

Total Monochrome

COLOR

UNITS % OF TYPE

30,203,000 49.9%30,295,000 50.1%

60,498,000

& Color TV Sales 121,976,000

% TOTALmono/color

(50.4%)

(49.6%)


that, for all practical purposes, allof the TV receivers in use as of theend of 1974 were produced duringthe preceding ten-year period(1965-1974) and, consequently, asrevealed by the EIA sales -to-

dealers statistics in Tables 1, 2,

TABLE 3TV Sales To Dealers 1970-1974

(By Year & Type)

YEAR

MONOCHROME (add 000)

TABLE/PORTABLE CONSOLE/COMBOS

UNITS UNITS1970 4,172 91.8 374 8.21971 4,530 92.4 344 7.11972 7,851 96.4 294 3.61973 6,787 96.5 246 3.51974 5,791 97.5 150 2.5

YEAR

COLOR (add 000)

TABLE/PORTABLE CONSOLE/COMBOS

UNITS UNITS1970 2,419 50.2 2,403 49.81971 3,461 56.0 2,720 44.01972 5,340 63.7 3,038 36.31973 6,081 65.6 3,182 34.41974 5,304 67.7 2,526 32.3


and 3, are predominately tableand portable models.

I have not been able to uncoverany data which positively provesthat a significant percentage ofthe receivers which EIA classifiesas "table" models are sufficiently

Exactreplacements.

Wheneveryou need them.

Whereveryou are.

Triad is known for more than just unsurpassed quality. We alsohave one of the most complete lines of transformers in theindustry. Whether you need replacement transformers fortelevisions, hi-fis or radios, Triad has the exact unit tofit. From power, filament and audio transformers to flybacksand yokes. And they're all available whenever you needthem, wherever you are. Find out for yourself. Write Triadtoday for your free catalog.

TRIAD-UTRADLitton Distributor Services

305 N. Briant St., Huntington, Indiana 46750...for more details circle 125 on Reader Service Card


small and light enough to be easilylifted and transported by mostconsumers. However, according tothe EIA, the majority of color TVreceivers sold in 1974 were in thebelow -21 -inch category, with 19 -

inch receivers the best selling size.And, says EIA, the 12 -inch size ac-counted for almost 50 percent ofmonochrome TV sales in 1974.

Complementing these indica-tions of the increasing popularityof smaller screen sizes is what theEIA calls a "continuing transitionto all -solid-state designs," most ofwhich are significantly lighterthan comparable tube and hybriddesigns. According to the EIA,"72.6 percent of color and 39.1 per-cent of monochrome receiversmanufactured or imported in 1974were fully solid-state."

The preceding data does not byitself conclusively prove that ashift from in -home to carry -in TVservicing is occurring. However,in my opinion, it does indicate thatthere is a sufficient percentage oftable and portable models in thepresent TV set population to makesuch a shift highly probable, and ifit is not yet occurring, it probablywill in the near future.

How and to what degree theprofitability of TV servicing willbe affected by the seemingly in-evitable shift of an increasinglylarger percentage of total volumeto carry -in business is difficult topredict. However, there undoubt-

TUNE

8111811111.0

if%S.

1JUS

I I.$.AN LY

WITH CABLES

ORATIONE YEAR

GUARANTEE

(7)STILL ONLY

M.1111111IM

U.S.A.ONLY

MAJOR PARTSAND SHIPPING

CHARGEDAT COST

FEATRES

A UHF Tuner with70 channels which aredetented and indicatedjust like VHF channels.

A VHF Hi GainSolid -State Tuner

AC Powered

90 -Day Warranty

Demonstrate the PrnMilerirl toyour customers and show improvedreception with their TV sets.

You may place your order throughany of the Centers listed below.

FLASH

TSC

WATCH USGROW

PROVIDES YOU WITH A COMPLETE SERVICEFOR ALL YOUR TELEVISION TUNER REQUIREMENTS.

VHF OR UHF ANY TYPEUHF/VHF(U.S.A. ONLY) $ 9.95COMBINATION (U S.A. ONLY) $15.00

Major Parts and Shipping Charged at Cost.

Fast, efficient service at our conveniently locatedService Centers.

AII tuners are ultrasonically cleaned, repaired,realigned, and air tested.

REPLACEUNIVERSAL REPLACEMENT TUNER $12.95 (U.S.A.only)

This price buys you a complete new tuner built spe-cifically by Sarkes Tarzian Inc. for this purpose.

All shafts have a maximum length of 101/2" whichcan be cut to 11/2".

Specify heater type parallel and series 450 mA.or 600 mA.

Customized tuners are available at a cost of only$15.95. With trade-in $13.95. U.S( A only)

Send in your original tuner for comparison purposesto any of the centers listed below.

N OW AVAILABLE- TUNER SERVICE PARTS CATALOG OF ALLSARKES TARZIAN VHF AND UHF TUNERS, INCLUDING EXPLODED VIEWDRAWINGS. OVER 200 PAGES. ORDER YOUR COPY TODAY. SEND $2.50WITH ORDER TO BLOOMINGTON HEAD OFFICE.

HEADQUARTERSARIZONA TUCSON, ARIZONA 85713CALIFORNIA NORTH HOLLYWOOD, CALIF. 91601

BURLINGAME, CALIF. 94010MODESTO, CALIF. 9531e

FLORIDA

GEORGIAILLINOIS

BLOOMINGTON, INDIANA 47401 537 South Walnut Street Tel. 812-334-04111528 S. 6th Avenue Tel. 602-791-924310654 Magnolia Boulevard Tel. 213-769-27201324 Marsten Road Tel. 415-347-5728123 Phoenix Avenue Tel. 2 9-521-8051

TAMPA, FLORIDA 3360 1505 Cypress Street Tel. 8 3-253-0324. LAUDERDALE, FLORIDA 33315 104 S.W. 23rd 16 711. 5-524-0914

A LANTA, GEORGIA 30310 va . 404 8-2232CHAMPAIGN, ILLINOIS 61820 405 ant U el. 21 56-6400SKOKIE, ILLINOIS 60076 5110 West ro Tel. 312- 0230

est t. Cla Tel. 31 -34932244 ayloAwille 452-11913025 fcr Ave 8-221-3027

5 Jteistersto 1-358-1186PRINGFIELD, MASSACHUSETTS 011 e 405 Dickinson 13-788-8206

. LOUIS, MISSOURI 6313 10530 Posie_A =nut 14-429-0633S VEGAS, NEVADA 89102 2 -Western venue r2-384-4235

II, NEW JERSEY 086 8 1139 PennSylvan 9-393-0999CITY, NEW JERSEY .7307 547-49 To ele A 1-792-3730

G BORO, NO. C 14 919-273-6276CINCI ATI, OHIO 45216CLEVELAND, OHIO 44109 4 25 Pearl

Vine 513-821-5080... .... I. 216-741-2314

PORTLAND, OREGON 97210 1 .2.--14.- van ... el. 503-222-9059TTSBURGH, PA. 15209 5031/2 Grant e a Tel. 412-821-4004

kti,PHIS,. TENNESSEE 0311 3158 Baron ye a . . .. ..... Tel. 901-458-23555, TEXAS 75218 11540 Garlan Roe el. 214-327-8413

NORFOLK RGINIA 23513 3295 Santos I. 804-855-251805 Decari oule 514-748-8803

CALGARY, ALBERTA T2H-OL1 8 42nd_ venue S.E 403-243-0971P.O. Box 5823, Stn. "A"

INDIAN ( INDIANAPOLIS, INDIANA 46204 .

KENTUC LOUISVILLE, KENTUCKY. 4 ...LOUISIA SHREVEPORT, LOUISIANA 71104MARYLA .... ALTIMORE, MARYLAND 21215MAS 1

MISNEVADA

91'NEW JERSEY ,Ji4-NO. CAROLINA

OHIO

OREGONPENNSYLVANIATENNESSEE 47TEXASVIRGINIACANADA ST. LAURiStAT, QUEBEC H4N-2L7

IF YOU WANT TO BRANCH OUT INTO THE TV TUNER REPAIR BUSINESS,WRITE TO THE BLOOMINGTON HEADQUARTERS ABOUT A FRANCHISE.

...for more details circle 126 on Reader Service CardJANUARY 1976, ELECTRONIC TECHNICIAN/DEALER / 11

edly will be an impact, and thesooner that servicers recognize thetrend and react to it, the greaterwill be their chances of overcom-ing any negative aspects and, con-versely, of taking advantage ofany positive aspects.

On the one hand, more carry -inbusiness and less in -home servic-ing seemingly should improve theoverall productivity of servicebusinesses, making them moreprofitable. Direct improvementsin technician productivity should

result from having all or mosttechnicians working in the shop,where tighter supervision andmore efficient workload controlare possible, along with easier ac-cess to a larger, more completeparts inventory, a broader rangeof test equipment and a more com-prehensive service library.

In addition, with more businessfrom carry -in trade and less fromin -home servicing, servicebusinesses should be able to sig-nificantly reduce the redundant

Free Stapler0.9.,

le II. 4,'es) ,s 0.S.c.

1011)1.

% . 64' C9. ,9f(

14°<er $'

When youstock up nowon Perma PowerColor-Brites...the serviceman's staple.For a limited time, you can save$4.65 on a four -pack of PermaPower Model C-511 Color-Brites.And the stapler is our gift!

Perma Power Color-Brites areamong the staples of your busi-ness. Model C-511 fits most colortubes. Easy to use, it plugs rightin, instantly restores faded color,contrast and sharpness to theolder color television picture tube,extending useful life a full yearor more! And your customer willremember you happily when re-placement time comes.

Check your stock of PerrnaPower Color-Brite, while you canbuy this serviceman's staple atsavings of $1.16 per britener. Hurry,supplies are limited, so see yourdistributor today.

Perma PowersColor-Brite

A PRODUCT OF

tt vChambErlainChamberlain Manufacturing CorporationPerma Power Division5740 North Tripp Avenue, Chicago, Illinois 60646Telephone: (312) 539-7171

inventories of equipment andparts required to stock servicevehicles. These savings, plus thoserealized from reductions in over-head expenditures for vehicle op-eration, maintenance, insuranceand licenses, if used in total or inpart for more efficient shopfacilities and equipment, couldfurther improve the productivityand profitability of most servicebusinesses.

On the other hand, a shift tocarry -in service might requirethat the shop be relocated to anarea more conveniently accessibleto customers, with a larger park-ing space and carry -in area. It alsomight require a larger space forTV storage.

Of the many possible changesthat could result from what ap-pears to be a gradual but inevita-ble trend toward carry -in businessas the predominate source of TVservicing income, perhaps themost significant possibility is there-emergence of the "TV sales andservice dealer" as the prime mer-chandiser of consumer entertain-ment and communications elec-tronic products.

High customer traffic, lowerprices and higher volume arethree interdependent factorswhich have permitted mass mer-chandisers to siphon a significantvolume of business away from TVsales and service dealers. Carry -inTV servicing, which literallyshould bring back to the doors ofTV sales and service dealers in-creasing numbers of consumers,just might bring back sufficienttraffic and therefore sufficientsales volume to permit sales andservice dealers to reduce or elimi-nate the one advantage that massmerchandisers have enjoyed-lower prices.

Once the pricing edge of massmerchandisers is reduced oreliminated, the advantages thatsales and service dealers have al-ways been able to offer consum-ers-the convenience and confi-dence of being able to obtain prod-uct, installation and service froma single source which by nature issignificantly more knowledgeableand therefore more helpful thanany other source of consumer elec-tronic products-should tip thescales in favor of the sales and ser-vice dealer.M


12 / ELECTRONIC TECHNICIAN, DEALER, JANUARY 1976

ME itall

POP gnuBE MID

They work when you need 'em!

Factory -fresh parts, manufac-tured at our own plants aroundthe world! No re -brands! Nopurchases from other manufac-turers! Every semiconductor wesell, we manufacture and standbehind 100%.

MOTOROLAREP

44iillMosioNotio;:-.:44t "..:-:-:,-4.!,

.............II -.' rg la 74 litr, I.

1',:. : ;Se....

............. . . . ...

........................ - ........: ..................................

: .....................

And you can a es d urComplete Omiconductor Cross -Reference and Guide- Over 55,,W10 different semiconductor typesincluding foreign devices are cross-referenced in thisNEW 156 -page catalog.Semiconductor Selector Guide for the ElectronicTechnician & Serviceman. A replacement guide forthe professional service technician when directcross-reference is not available.Semiconductor Integrated Circuit ReplacementGuide for Home Entertainment Products.For IC replacements in TV Receivers, AM & FMReceivers and Hi-Fi Equipment.

HE Prices Gnat leave room FOP sour ROMS!

MOTOROLAP. 0. Box 209:24 Phoenix, AZ 85034 ER

SEMICONDUCTORS



GTE Sylvania & PhilcoColor TV 1976

By Joseph Zauhar

All -solid-state chassis, with emphasis onautomatic tuning, highlight GTE Sylvania's and

Philco's color TV lines

GTE Sylvania introduced anall -solid-state line consisting of 49color TV sets, and five home enter-tainment centers which are TV/stereo combinations. Forty-four ofthe receivers now feature GT-Matic self-adjusting tuning, 37have the GT-Matic II feature.

The line includes 13-, 17-, 19-,21- and 25 -inch (diagonal) screensizes. The 15 -inch screen size hasbeen discontinued in the new line.

Included in most of the TV setsis a negative guard band blackmatrix color picture tube, featur-ing a dark faceplate which absorbsroom light and provides highercontrast and a sharper picture.The Dark-Lite 50 picture tube isemployed in 26 of the 25 -inch(diagonal) color TV sets and in allhome entertainment centers. Thispicture tube is employed in a21 -inch model, and in two 19 -inchportable TV sets. In three 19 -inch (diagonal) and four 17 -inchsets the picture tube is designated

Dark-Lite. Five 13 -inch sets; four17 -inch units and three 19 -inchmodels will employ the Chroma-Line, in -line picture tube.

Six chassis will be employed inthe new color TV line.

The Ell and E12 color TV chas-sis will be used in the 19-, and 25 -

inch (diagonal) screen size sets,featuring GT-Matic II self-adjusting tuning. The E20 chassiswill be used in 13 -inch (diagonal)table TV sets without the GT-Matic feature or with GT-Matic I.The E21 chassis will be employedin 17- and 19 -inch (diagonal) sizetable model TV sets with or with-out the GT-Matic I tuning. TheE40 chassis will be employed in25 -inch (diagonal) consoles and21 -inch table models with theGT-Matic II tuning feature. TheE10 chassis is carried over fromlast year and will be employed in

Photos and illustrations supplied throughthe courtesy of GTE Sylvania.

R230680

0202VID.BUF

C246220

R900iK

R233390

6904TO 10400 100PIN I

TO 10600PIN 5 CONTRAST

C247

50

R902150

891510K

TRiPLER

H V. WINDING7400

1998 SC996

50

991910K

124V

0902VIDEO

AMP

C918/2.250

R906IK

R4I7 0900NOISE 6.86

BLKINPUT >FROM CLMP1C400 SC417 Amp

R9I610K

C9241500

SC9I6

TO CRT2NDANODE

R996186

#918 L920 L926I.8K

R920 01920

C920

14924

#922

#91433K

SC924

89I2 ,R456,1.26

8913 J 2KR92I

220 (BR.RANGE)

R9082K

BLACKLEVELEIR.CONTROL)

0.24v

R926

4-24V0

C9z817921?

VA 0624VBLANKING

0404H. BLANKING

R45822K

0904To a B

VIDEO DRIVER

DRV.i8932 SERVICE

56 SW900A

Fig. 1-Automatic Black Level circuit employed in GTE Sylvania's E20/21 color TV chassis.

25 -inch (diagonal) screen size TV.

Color TV Chassis E11/E12

The Ell and E12 are the high-est performance color TV chassisand are employed in 25 -inch(diagonal) color TV receivers. Thechassis provides 30 kv of highvoltage, and has the GT-Maticfeatures.

A Ferro -Resonant Self -Regulat-ing power transformer is usedwhich provides a number of ad-vantages.

The power supply regulator cir-cuit automatically compensatesfor variations in power line volt-ages, maintaining constant chas-sis voltages. The transformer actsas a surge protector absorbing linevoltage surges and transients,preventing damage to criticalcomponents employed in the chas-sis. Lower power consumption, re-duces chassis heat. The Ferro -

Resonant transformer draws onlyas much power as is actuallyneeded, electronic regulatorsdraw a higher level of power andconvert the excess energy intoheat.

Seven plug-in IC's (eight inVaractor-Tuner models), approx-imately 36 plug-in transistors, (68in Varactor-Tuner models), fourtransistors in Varactor tuners andthree transistors in the turrettuners are employed.

IC's are employed in the AutoColor/Auto Tint, Auto Black/White, Chroma Amp/SubcarrierRegenerator, Chroma Demodula-tor/Drive, Vertical Countdown,Horiz/Sync, Sound Demodulator,and the Voltage Regulator circuit(Varactor Models).

Plug -In Circuit Modules

Four modules perform the cir-cuit functions and they are sensi-bly and functionally grouped tosimplify troubleshooting of thechassis if required.

IF/Sound Module-The moduleis new and is not interchangeablewith other existing chassis orpanels. The module contains im-proved AFC and AGC circuits.

Video/Chroma Module-TheGT-Matic circuitry included onthis module is identical to and in-terchangeable with the E09, E10,and E40 chassis VideolChromapanel. It is not interchangeablewith older models or panels.

Deflection panel-this panel is

14 / ELECTRONIC TECHNICIAN,DEALER, JANUARY 1976

1111111heriiiiiw- It

designed to drive the 30 kv deflec-tion system and it is interchange-able with other existing panelsused in previous Ell chassis.

Bandswitch Panel-The panelis only used with the varactortuner models. The Ell chassispanel is interchangeable with pre-vious Ell chassis modules. TheE12 chassis panel is new and notinterchangeable.

UHF Control Module-Thismodule is employed on the 21 De -tent tuner. It supplies the tuningvoltage for the Varactor UHFtuner and AGC voltage to bothtuners.

Color TV Chassis E20/21

The E20 and 21 color TV chassisare the second generation familyof 100 percent solid-state chassiswhich are designed for use in 13 -through 19 -inch (measureddiagonally) screen size color TVreceivers where size, weight andcarry -in service policy are of majorconsideration. They replace, andare mechanically very similar tothe E06/E08 chassis with modifi-cations made in the configurationof the chassis to be used with the

ceiver cabinets.

Chassis FeaturesThe following chassis features

have been carried over into theE20 and E21 from last year's E06and E08 all solid state chassis.

Eight plug-in integrated cir-cuits (seven on models without theGT-Matic feature) and 27 plug-intransistors (26 on TV modelswithout the GT-Matic feature).

The number of IC's employedremains the same as in the E06/E08 chassis. The functions of thetwo IC's employed in the IFamplifier are as follows:

Integrated Circuit IF Amplifi-er-Two IC's replace the three orfour discrete transistors normallyused in the IF amplifier. One IC isused as a low level synchronousvideo detector. Because of its bet-ter detection linearity the syn-chronous detector reduces un-wanted frequency by-products ofthe detection process to a levelwell below that of a standard diodedetector.

GT-Matic Features

The GT-Matic features found onthe step-up models include: Verti-

cal Countdown IC (eliminates thevertical hold control). Horizon-tal -Sync IC (eliminating the hori-zontal hold control). Two-partcolor level circuit. Perma-Tintflesh -tone correction circuit.Black Level Clamp circuit. Au-tomatic frequency control (AGC).Automatic voltage regulation.The non-GT-Matic TV models in-clude many of the GT-Matic fea-tures. All include the Black LevelClamp circuit, horizontal/sync IC,Perma-Tint flesh tone correctioncircuit, amplified AGC and au-tomatic voltage regulations.

Most of the new circuit em-ployed in the E20/E21 chassis ispossibly the most critical parame-ter in producing a good color pic-ture with proper color intensity.

We often find that if the blacksare too light, the picture will lookwashed out and if the blacks aretoo dark, the important lowbrightness portions of the picturewill be lost and the picture willappear to have too much color.

A relatively simple Black LevelClamp circuit (Fig. 1) has beenadded to the chassis. This circuitrecognizes the blackest informa-tion in the scene and maintains itat some predetermined levelwhich has been preset by theviewer with the brightness con-trol.

Clamping the black video levelis an effective method of retainingthe black level in the video chan-nel. This circuit function preventsthe black level from becoming toodark or becoming too grey orwashed out. This situation occursunder certain conditions of vary-ing transmitted signal, receivedand detected video signal.

The video signal is AC coupled

through capacitor C247, from thebuffer stage, where the contrastlevel is adjusted to the viewerspreference, to transistor Q902 thevideo amplifier and Q900, theblack clamp amplifier. Noise can-cellation also occurs in the basecircuit of Q900 by coupling posi-tive noise pulses through diodeSC419. This circuit action pre-vents the black amplifier from de-tecting noise and setting up ablack level voltage related to it.

Horizontal pulse cancellation isalso required and accomplished bytying the collectors of Q900 andQ404 together with resistor R914.Tying of the collectors causesQ900 to be disabled during hori-zontal blanking. The horizontalblanking pulse which in turn low-ers its collector voltage to four orfive volts and removes all B+voltage on the collector of Q900.

The black level is set by adjust-ing the brightness control, whichin turn, controls the conductionlevel in Q900. The black clampamplifier base voltage is de-veloped through the resistor diodeconsisting of R456, R914, SC 916,C918, R916, R915, and its emittervoltage is developed throughR908, R921, R912, and R913.

The adjustment of the bright-ness control, R908, varies the DCvoltage obtained at test pointTPA. By lowering or raising theblack clamp amplifier emittervoltage it will in turn lower orraise the DC level at test pointTPA. By the same circuit actiondeveloped in the black clampamplifier, the black level is pre-served. When the black video sig-nal tries to drive the DC level attest point TPA, lower than thepreference level, Q900 reduces

4244

COMPOSITEVIDEOPLUSN 8 VBLANKING

1C802 DEMOD.

CHM/A

S CV/

Z CV,

13944REDDRIVE R945

0906REDOUT

Fig. 2-The R. G and B amplifier. demodulator and video output circuits employed in GTE Sylvania'scolor TV chassis E20/21.

Nnl

JANUARY 1976, ELECTRONIC TECHNICIAN; DEALER / 15

An Extraordinary Offerto introduce you to the benefits of Membership in

ELECTRONICS BOOK CLUBfor a limited time only you can obtain

THIS

CETGIANT276 -Page License Handbook

foronly 49 WITH

TRIALMEMBER-

SHIP

May we send you this helpful newbook as described on the facing

page as part of an unusual offer of aTrial Membership in Electronics BookClub ?

This is a quality hardbound volume,especially designed to help you in-crease your know-how, earning power,and enjoyment of electronics.

This handsome, hardbound bookis indicative of the many other fineofferings made to Members . . . impor-tant books to read and keep . . . vol-umes with your specialized interests inmind.

Whatever your interest in electron-ics -radio and TV servicing, audio andhi-fi, industrial electronics, communi-cations, engineering -you will findElectronics Book Club will help you.

With the Club providing you withtop quality books, you may broadenyour knowledge and skills to buildyour income and increase your under-standing of electronics, too.

How You Profit from Club Membership

This special offer is just a sample ofthe help and generous savings theClub offers you. For here is a Club de-voted exclusively to seeking out onlythose titles of direct interest to you.Membership in the Club offers youseveral advantages.1. Charter Bonus: Take "CET LI-CENSE HANDBOOK" . . . publisher'slist price $8.95 . . . for only 49¢ withyour Trial Membership.2. Guaranteed Savings: The Clubguarantees to save you 15% to 75%on all books offered.3. Continuing Bonus: If you continueafter this trial Membership, you willearn a Dividend Certificate for everybook you purchase. Three Certificates,plus payment of the nominal sum of$1.99, will entitle you to a valuableBook Dividend which you may choosefrom a special list provided members.4. Wide Selection: Members are an-nually offered over 50 authoritative,new books on all phases of electronics.

5. Bonus Books: If you continue inthe Club after fulfilling your TrialMembership, you will receive a BonusDividend Certificate with each addi-tional Club Selection you purchase.For the small charge of only $1.99,plus three (3) Certificates, you mayselect a book of your choice from aspecial list of quality books periodical-ly sent to Members.6. Prevents You from Missing NewBooks: The Club's FREE monthlyNews gives you advance notice of im-portant new books . . . books vital toyour continued advancement.

This extraordinary offer is intendedto prove to you, through your own ex-perience, that these very real advan-tages can be yours . . . that it is pos-sible to keep up with the literaturepublished in your areas of interest . . .

and to save substantially while so do-ing.

How the Club Works

Forthcoming selections are describedin the FREE monthly Club News.Thus, you are among the first to knowabout, and to own if you desire, sig-nificant new books. You choose onlythe main or alternate selection youwant (or advise if you wish no bookat all) by means of a handy form andreturn envelope enclosed with theNews. As part of your Trial Member-ship, you need purchase as few as fourbooks during the coming 12 months.You would probably buy at least thismany anyway . . . without the sub-stantial savings offered through ClubMembership.

Limited Time Offer!

Here, then, is an interesting oppor-tunity to enroll on a trial basis . . . toprove to yourself, in a short time, theadvantages of belonging to Electron-ics Book Club. We urge you, if thisunique offer is appealing, to actpromptly, for we've reserved only alimited number of books for new Mem-bers.

To start your Membership on these

attractive terms, simply fill out andmail the postage -paid airmail card to-day. You will receive "CET LICENSEHANDBOOK" for 10 -day inspection.SEND NO MONEY! If you are notdelighted, return it within 10 daysand your Trial Membership will becancelled without cost or obligation.Electronics Book Club, Blue RidgeSummit, Pa. 17214.

Typical Savings Offered ClubMembers on Recent Selections

Servic. Cassette/Cartridge Tape PlayersList Price $9.95; Club Price $6.95

Small Appliance Repair Guide -Vol. 2List Price $7.95; Club Price $4.95

Logical Color TY TroubleshootingList Price $8.95; Club Price $5.95

How to Repair Small Gasoline EnginesList Price $8.95; Club Price $5.95

TV Tuner Schematic/Servicing ManualList Price $9.95; Club Price $6.95

Practical Test Instruments You Can BuildList Price $7.95; Club Price $4.95

The Complete FM 2 -Way Radio HandbookList Price $9.95; Club Price $6.95

How to Trbshoot./Rep. Elect. Test Equip.List Price $9.95; Club Price $6.95

RCA Color TV Service Manual -Vol. 3 & 4List Price $17.90; Club Price $8.95

Electronic Experimenter's GuidebookList Price $7.95; Club Price $4.95

Introduction to Medical ElectronicsList Price $9.95; Club Price $6.95

Basic Digital ElectronicsList Price $7.95; Club Price $4.95

Auto Stereo Service & InstallationList Price $8.95; Club Price $5.95

The Home Appliance ClinicList Price $7.95; Club Price $4.95

Directional Broadcast AntennasList Price $12.95; Club Price $7.95

Effec. Troubleshooting with EYM & ScopeList Price $8.95; Club Price $5.95

Modern Communications Switching Sy.List Price $17.95 Club Price $13.95

Prac. Gd. to MATV/CCTV Sys. Des. & Ser.List Price $9.95; Club Price $5.95

Prac. Circuit Design for the ExperimenterList Price $8.95; Club Price $4.95

Amateur FM Conversion/Constr. ProjectsList Price $8.95; Club Price $5.95

Elec. Unraveled/New Commonsense App.List Price $7.95; Club Price $4.95

Installing TV & FM AntennasList Price $7.95; Club Price $3.95

Commercial FCC License HandbookList Price $9.95; Club Price $5.95

Mod. Gd. to Auto Tuneup/Emis.-Ctrl. Svc.List Price $8.95; Club Price $5.95

MATV Systems HandbookList Price $7.95; Club Price $4.95

SENDNO MONEY! Simply fill in and mail postage -paid Airmail card today!

CET LICENSE

HANDBOOKwith Consumer Electronics,

Audio & Industrial Electronics

Options By Joseph J. Carr

276 pages 250 illustrations

Handsome, hardbound volume

Partial List of ContentsPreparing for the CET Exam: Who May

Take the CET Examination-About ThisStudy Guide-Good Study Habits

Basic Electronic Circuits: Ohm's Law-Alternating Current-Basic ElectronicCircuits

Basic Circuit Math: Basic Circuit MathElectronic Circuits: RC Networks-Reac-

tance - Impedance - Resonance -High- and Low -Pass Filters-ElectronicCircuits

Amplifiers, Detectors and Oscillators:Amplifier Configurations-Classificationby Conduction Angle-Coupling Tech-niques-Push-Pull Operation-Oscilla-tor Circuits-AM Detectors-FM De-tectors-Power Supply Circuits-Am-plifiers, Detectors, and Oscillators

Signals and Waveforms: Amplitude Mod-ulation-Frequency Modulation-Multi-plexed Stereo on FM-Television Sig-nals-Miscellaneous Waveforms andSignals-Signals and Waveforms Usedin Electronics

Antennas and Transmission Lines: Trans-mission Lines for TV-Antenna Designs-Antenna Measurements - Antennasand Transmission Lines

Electronic Test Equipment and Its Use:Measurements of Voltage, Current, andResistance - Signal Sources - Oscil-loscopes - Electronic Test Equipmentand Its Use

Solid -State Devices: Semiconductor Di-odes-Transistors-Field-Effect Transis-tors - Unijunction Transistors - Four -Layer Devices-Solid-State Devices

Components Used in Electronics: ResistorColor Code-Capacitor Color Coding-Electrolytic Capacitors - Inductors -Switches-Components Used in Elec-tronics

Monochrome Television Circuits: CathodeRay Tube-TV Receiving System-Monochrome Television Circuits

Color Television: The Color Signal-Ver-tical and Horizontal Circuits-ColorCircuits-Color TV

Waveform Analysis: Service Scope-TVby Waveform Analysis - WaveformAnalysis

Sample CET Examination: Sample TestAnswer Key

CET Audio Option: Scope of the Exam-ination-Organization of the StereoSystem-Power Amplifiers-DistortionTests - Frequency Response - PowerMeasurement - Electromechanical De-vices-Tapes and Noise Reduction-CET Audio Option

CET Industrial Electronics Option: SCRand Triac Circuitry-Servomechanisms- Digital Electronics - CET IndustrialElectronics Option

A new, complete and practical guide to moremoney and prestige through CET certification. . . featuring the first coverage of the new audioand industrial exams!

This brand-new volume is intendedas a review for anyone preparing

for a CET (Certified Electronic Tech-nician) exam (television, audio, or in-dustrial), a state or local licenseexam, or a job -entry exam. The mate-rial is arranged logically for minimumstudy time and maximum retention,and each Chapter contains questions(with answers) at the end typical ofthose appearing in the real exams. Inall, there are 538 questions and an-swers in this unique new volume.

The first few Chapters explain theadministration and scope of the CETexams, which are given by the Na-tional Electronics Association (NEA).They offer a review of simple AC andDC circuits, and include a painless"minicourse" in simple circuit math-no difficult math is required.

To prepare you for specific testquestions, various common circuits areclearly explained: filters, resonantcircuits, differentiators, etc. One Chap-ter is devoted to universal circuits us-ng tubes and transistors. Then, antic-pating the CET exam's RF questions,

a meaty Chapter tells how AM, FM,and TV signals are shaped up andshipped out by modulators and trans-mitters. This makes the book extreme-ly practical as a reference volume aswell as a study guide.

Systematically, the text takes thereader through antennas and trans-mission lines, electronic servicingequipment, the use and application ofcommon circuit components, basic TVtheory, and troubleshooting. Thenthere is a complete guide to waveformanalysis and its use in TV trouble-shooting. You'll find this informationpriceless for day-to-day servicing-you'll refer to it again and again.

In brief, here is all the dope youneed to pass the two brand-new CETexams and qualify as an industrialand audio electronics expert-THISIS THE FIRST CET GUIDE WITHSUCH COVERAGE! A replica test,which will serve as a dry run for theCET exam, is included to help youknow you're ready for the real thing!276 pages, 289 illustrations. Hard-bound. Publisher's List Price $8.95.

0,

COLLECTOR

BASE 02

COLLECTOR

EMITTER EMITTER

PNP TRANSISTOR -MOLE NPN TRANSISTOR -ELECTRONFLOW FLOW

Fig. t7. Symbols for bipolar transistors.

ERE Mira111 El I

Fig. 12.7. An example of 10 demodulation.

WEI

Over 250 clearly drawn illustrations and schematics-plus easy -to -understandtext-cover scores of topics like test equipment, color TV, solid-state devices, etc.

AN EXTRAORDINARY OFFER......for more details circle 114 on Reader Service Card

conduction, and its collector volt-age rises, charging capacitor C918through SC916 to a higher DClevel. This voltage is connected totest point TPA through R916 andprevents the DC level change re-lated to the black video level in-crease.

Improved Color Fidelity

FCC regulations state that, forthe color TV system approved forbroadcasting in the U.S., the R, G,B, voltages used to form the com-posite color signal are to be suita-ble for a color picture tube havingprimary colors with NTSCchromaticity coordinates. Somepicture tubes may have phosphorswhose chromaticity differ sub-stantially from these primaries. Ifthe signals applied to these tubesare formed by color decodingwhich is the inverse of the NTSCencoding, color errors will result.

In the E20 and E21 chassis thecolor decoding has been modifiedto minimize these errors. As a re-sult better greens and reds shouldbe obtained with some improve-ments also noticeable in the fleshtone and magenta colors.

The circuit supplying the cor-rection signal to the chromaticityis found in the R and G amplifier,(Fig. 2) and it functions by increas-ing the emitter voltage of theamplifier not being driventhrough R985 a 1.8 K resistor,which is connected to the emittersof Q906 and Q908. This circuitfunctions to turn down the colordriver, reducing the beam currentfor that color.

Color TV Chassis E40

The E40 color TV Chassis whichis employed in both the 21- and25 -inch (measured diagonally)color TV receivers is an all solid-state modular chassis.

If the chassis is used in eitherscreen size TV receivers they willbe electrically identical and usethe same set of circuit modulesand deliver 26.5 kv of picture tubesecond anode voltage.

The full power transformerchassis has clean, uncluttered,layout design which permits freeaccess from both sides of the chas-sis and the circuit panels areroadmapped from the top and bot-tom sides. The major componentsand sub -assemblies plug into themain frame of the chassis. All

seven IC's and approximately 36transistors plug-in to make servic-ing of the chassis easier.

In the E40 color TV chassis theDeflection and Video/Chromapanels are identical to and inter-changeable with those employedon the E09 and E10 chassis. Thenew IF/Sound panel is not inter-changeable with the previousmodels.

The automatic control systemused in the E40 chassis consists ofthe following ten elements:

Sample and Hold AutomaticColor Level Circuit. Automatic

Fig. 3-The Remote Control Cluster has theremote receiver chassis mounted above the21 -position UHF/VHF strip tuner.

Fig. 4-Remote Control, Five -Button, Transmitter Model 17 replaces the older bulky case androcker arms.

Fig. 5-The control module is side mounted, tothe lower left side of the control panel cluster.

Black -Level Circuit. AutomaticWhite Level/Contrast Circuit.Selective Automatic Tint Circuit.Vertical Countdown IC. Horizon-tal/Sync IC. Automatic Fine Tun-ing (AFC). Keyed Automatic GainControl. Automatic (Color) PhaseControl and Automatic VoltageRegulator.

Some of the customer controlshave been eliminated and the re-maining controls employ inte-grated circuits which act to main-tain their picture settings evenwith some wide variations of sta-tion transmissions or adverse re-ception conditions for better pic-ture performance.

The Sylvania developed IC withsync separation, automatic noisegate and double balanced horizon-tal frequency control, plus theVertical Countdown IC providegood picture stability in the pres-ence of electrical noise and othertypes of interference.

Five Function Remote Control System

Color TV receivers with theOne -Knob Rotary Tuning Systemare now available with a newfive -function remote control sys-tem.

The new remote control systememploys the following features:

Two -Way Channel Selec-tion-enables tuning to a higheror lower channel with equal ease.

Two -Way Preset Volume-Separate volume up and volumedown functions. The volume con-trol employs an electronic mem-ory.

On/Off-Depressing a buttonwill turn the TV receiver on andoff alternately without changingthe volume or channel selections.

Full manual control of allfunctions on the color TV receiver.

The low three -watt standbypower can be switched off forenergy conservation or vacations.

The new transmitter is de-signed for better reliability,greater ease of alignment and ispowered by a nine -volt battery.

Remote Control Tuner Cluster

The tuning cluster assembly(Fig. 3) has the remote receiverchassis mounted above the 21 -

position UHF/VHF strip tuner.Removing the receiver from the

tuner cluster is simplified, and re-quires loosening of three screwsand sliding the remote chassis


from the slots in the side brackets.

Remote Control Transmitter

The remote control transmitterModel R17, Fig. 4, has a new ap-pearance, with a new thin caseand square buttons.

The transmitter's circuitryemploys two transistors which arepowered by a 9 -volt battery.

Control Panel

The control panel (Fig. 5) on thefront of the TV set features thechannel window with insertableUHF channel numbers.

All picture controls are frontmounted in addition to the UHFmeter, AFC and Perma Tintswitches.

The control module providingAGC, AFC and tuning voltages tothe tuners, is side mounted to thelower left of the cluster and is an-chored by one screw.

Philco Color TV 1976

The Philco Consumer Elec-tronic Division of GTE SylvaniaIncroporated introduced its line of1976 color TV.

The Philco color TV line fea-tures four color portables, one 19 -inch, two 17 -inch and one 15 -inchset.

The 19 -inch (diagonal) ModelC2095GWA features a BOSS 200chassis (equivalent to GTE Syl-vania E21 chassis); Philcomaticautomatic tuning; black matrixpicture tube; lighted channel indi-cators, and a 5 -inch oval speaker.

The 17 -inch (diagonal) ModelC2705GWA includes the samefeatures as the C2905GWA, butemploys the BOSS 101 chassis(equivalent to GTE Sylvania E20chassis).

A 15 -inch (diagonal) model hasthe BOSS 100 chassis (equivalentto GTE Sylvania E20).

Two other 19 -inch portables inthe 1976 line were introduced ear-lier.

Ten 25 -inch (diagonal) color re-ceivers are included in the 1976Philco line. Seven are consoles,one is a table model, and two arehome entertainment centers-color TV and stereo combinations.Each features the BOSS solid-state modular chassis; PhilcoATC; black matrix picture tube;70 -position click -stop UHF tun-ing; lighted channel indicator andthe Philco-Guard System.II

C. b.type acceptance

dictatesEXACT REPLAGG ENT

fib Q

2SC799

RIVER

THE ORIGINAL WEP EXACT REPLACEMENT "THEIR" EQUIVALENTS *

INDIVIDUALLY

FRONT

LARGE MODEL NUMBER ANDGENERIC NAME IMPRINT FOREASY IDENTIFICATION.

CROSS REFERENCING TOMAJOR MANUFACTURERSON FRONT OF PACKAGE.

EASY VIEW BLISTER LETSYOU SEE THE PRODUCT.

* Based on latest available published cross reference data.

EXACT REPLACEMENTS FOR 2SC799AND 68 OTHER COMMUNICATIONTYPE TRANSISTORS ARE AVAILABLEFROM ULTRATEC'S COMMUNICATIONSEMI -CONDUCTOR CENTER. A 100%

COMMUNICATIONS ORIENTEDASSORTMENT.

EACH ULTRATEC SEMI -CONDUCTOR COMESBLISTERED AND MOUNTED ON A UNIQUEINFORMATIVE PACKAGE.

BACK

TRANSISTOR SCHEMATICWITH ILLUSTRATION.

TRANSISTOR'S USES.

- TRANSISTORCHARACTERISTICSWITH SYMBOLSAND RATINGS.

YOUR BUSINESS CARD OR LETTERHEAD WILL BRING FULLDETAILS AND SERVICE BY OUR FACTORY REPRESENTATIVE.

ULTRATEC®by WORKMAN ELECTRONIC PRODUCTS, INC.

PO Box 3828 Sarasota, Fla. 33578 / PO Box 5218 Redwood City, Calif. 94063



COLOR TV MODULE GUIDE

General Electric Color TV Modules

Ten modules are available for General Electric's present modular 25 -inch console TV receivers. Thesesame modules can be used to repair all of the earlier modular 25 -inch receivers, the earliest of whichbegan production in 1972. The chassis covered by these modules are the MA, MB, MB -75, MB -2, MC,MC -2, and MH chassis. Seven modules are available for all of General Electric's modular portablereceivers. This includes the 13 -inch, 17 -inch, and 19 -inch YA and 19 -inch YC chassis.

CHASSIS NUMBER

CATALOG NUMBER 4\`-' ,V.c N(b \ NC) ,\C5

,), r r, A A .4 AC)MODULE DESCRIPTION

IFEP93X37 X X X X X X X

AUDIOEP93X40 X X X X X X X

SIGNAL CONDITIONEREP93X44 X X X X X X X

HORIZONTAL BUFFEREP93X45

X X X X X X X

HV REGULATORE P93X46 X X X X X X

,

X

LOW LEVEL VIDEOEP93X74 X X X X X X X

RGBEP93X79 X X X X X X X

POWER SUPPLYEP93X80 X X X X X X X

VERTICALEP93X88 X X X X X X X

CHROMAE P93X89 X X X X X X X

CONVERGENCEEP93X64 X X X X

CRT SOCKETEP93X66 X X X X

VERTICALEP93X67 X X X X

POWER SUPPLY HORIZBUFFER EP93X68 X X X X

HORIZ OSCILLATOREP93X69 X X X X

CHROMA/VIDEOEP93X70 X X X X

IF/AUDIOEP93X72

X X X X

22/ ELECTRONIC TECHNICIAN/DEALER, JANUARY 1976

Portable DigitalMultimeter at anAnalog Price

MODEL 280Shownactual size

PRODUCTS OF DYFIASCAN1801 W. Belle Plaine Ave. C;h L 60613

ONLY

$9995less batteries and optional

AC adapter/charger

9 reasons why ournew meter shouldbe your next:1. ANALOG PRICE2. RELIABLE

Fully overload protectedBuilt-in battery checkImpact -resistant Cycolac'case

3. EASY TO READLarge 3 -digit LED readoutAutomatic polarity, decimalpoint and out -of -rangeindication

4. COMPLETELY PORTABLE;USE IT ANYWHERE

Only 4.38 x 6.38 x 2" deepOperates from 4 ordinary"C" cells or AC with optionaladapter/charger

5. HIGH -LOW POWER OHMSMew ures accurately in solidstate circuitry

6. HIGH RESOLUTION1mV, 1pA, 0.1 ohm

7. DIGITAL ACCURACYDC volts typically 1%F.S.; AC volts and ohmstypically -±2% F.S. except}2.5% on highest range

8. RANGESDC and AC volts, 0-1, 10,100, 1000V;DC and AC current, 0-1, 10,100, 1000mA;Ohms, 0-100, 1K, 10K, 1 meg,10 megs.

10 meg industry standardinput impedance

9. IN STOCK AT YOURDISTRIBUTOR



TECHNICAL DIGEST

ADMIRALColor TV Chassis M25 -Service Hint

A problem causing R104 (15 ohm, 2 watt) resistor tooverheat, and found in the 75 volt power supply can becaused by an open contact in the on/off switch, S105. Withthe Instant Play feature found in the M25 chassis, the B+circuit is opened when the on/off switch is in the off position.Both the start and finish of the secondary winding of T100

12

0 I)0

N 115,

ret

7 9

12 lI0_ _01_!

00/Off 3,1015105

7.111111' 1

vtiff

PARTIAL SCHEMATIC TUNER CLUSTER

00,11

PIM

E 10 Tom

74:IR II,/ Pi

NN

011

o I< 11<i0

TO .,0, vow.

6

,.0

.0111.--.<0 <0.11.01

PARTIAL SCHEMATIC CHASSIS

rare II/ /0X'1;

51520514'vErroopoias

are opened by sections A and B of 5105. With one switchsection open, the AC circuit is incomplete, resulting in ex-cessive current in R104.

Connect a jumper across the S105 A contacts, then acrossthe B contacts, to determine which section is open.

Color TV Chassis M10-Service Hint

Loss of color sync, snowy picture, hum in sound and darkband across the picture, can be caused by a defect on theM1000 Pincushion module.

The defective component would be associated with the 24volt scan -derived B plus supply. The symptoms may beintermittent and/or appear only after the set warms up.

Color TV Chassis M10-Service Hint

A symptom of high voltage shutdown circuit triggering,which causes pulsating audio and flashing (on -off) of theraster at a once per second rate, can possibly be caused byincreased 120 volt B+ line voltage. The increase can bepossibly caused by a defective pass transistor Q101 and/orQ102. The above problem can be comfirmed by measuringthe regulated 120 volt B+ supply line at fuse F900. Thisvoltage is adjustable by the B+ 120 volt Adjust control,R901, on the power supply board. You should be able to

vary it slightly above and below 120 volts. Leaky or shortedpass transistors can cause this voltage to increase to 140 or150 volts. If you have too much voltage on the 120 volt line,the problem is in the power supply. Increased B+ willresult in the horizontal system trying to produce excessivehigh voltage and the high voltage shutdown circuit willactivate.

If the set continues to operate with high B+ voltage,F900 (120 volt B+ fuse ) and F101 (1/16 amp fuse ) in thepass transistor circuit may open. This may be the result ofthe horizontal output transistor Q103 failing. If transistorQ103 shorts, it will cause F900 to open immediately whenthe TV set turned on. This transistor can be temporarilyremoved if suspected of being defective.

The 120 volt B+ supply can be operated with F900 re-moved for checking or repairing that supply (with no load,the voltage will increase by 2 to 3 volts.)

Be sure to discharge the power supply through a resistorto ground before installing the fuse (use a 10 K, 1 watt

.,57019610 575196 10miss100515101 11111151N110?

resistor). Grounding direct to the chassis will blow the 1/16amp fuse, F101. Discharge both sides of the fuse holderbecause the capacitors in circuits beyond the fuse may becharged.

Be sure to adjust the B+ 120 volt supply adjustment toexactly 120 volts when the repairs have been completed.

Note: Resistors R126 (5.6 ohm, 15 watt) and R127 (220ohm, 1/2 watt) added in RUN 16.

GENERAL ELECTRICColor TV "M" Series Chassis-Power Supply Transformers

Power supply transformers are now in stock for all "M"series chassis (MA, MB, MC, MB -75, MC -2, MB -2, MH).Complete power supply assemblies are not available forany of these chassis.

To determine which transformer to use for a specificchassis, consult the matrix shown:

Replacement transformers have crimped-on terminals

Chassis Power Transformer Notes

MA EP88X6

MB (early/ EP88X6 Original Transformer stamped EP62X34 or EP62X43

MB (late) EP88X4 Original Transformer stamped EP62X45

M8-75. MH,M09200

EP88X4

MB -2 EP88X4 Use with sets having separate filament transformer

MB -2 EP88X6 Use with sets having no filament transformer

MC EP62X54 Use with sets having a separate filament transformer

MC EP88X7 Use with sets having no filament transformer

MC -2 EP88X7


on all leads which go to sockets or connectors. There are twotypes of terminals: round and flat. They are shown in Fig-ures 1 and 2. With the illustrations, are instructions forremoving and installing the terminals.

The other leads must be cut to proper length and soldereddirectly to their terminals. Do not splice any leads.

Removal And Installation

1) Cut the wire from the old transformer as close to ter-minal as possible. 2) With a small screwdriver, push theterminal (from the wire side) out of the front of the recepta-

cle. 3) Push the new terminal in from the wire side until itsnaps into place. Shown in Fig. 1 is the round type termi-nal.

Removal And Installation

1) With a pair of pliers, grasp the wire from the oldtransformer close to the terminal and pull it out of thereceptacle. 2) Push the new terminal into the receptacleuntil it snaps into place. Shown in Fig. 2 is the flat typeterminal.

MAGNAVOXEight -Track Tape Player MODEL VE16-Mechanical NoiseAnd/Or Slow Speed

The 171396-1 kit for minimizing symptoms of mechani-cal vibration was announced in the May, 1975 Service Tips.The plastic thrust cap which is held against the motorpulley is available under Part No. 143745-1, if the onesupplied in the kit should ever require replacement.Mechanical noise or slow speed symptoms may result if thethrust cap wears out.

Star Remote Control-Use One Chip Sound Module Only

The STAR remote control system varies the volume levelby applying a DC voltage to the 703639 Sound Module inthe T995 color TV chassis. This Sound Module is the onewhich uses only one integrated circuit (one chip). SoundModule Part No. 703727-1, used in other T995 models, hastwo integrated circuits (two chip). The two chip and onechip Sound Modules are interchangeable in the T995 chas-sis, except with STAR models. STAR models must use theone chip Sound Module, Part No. 703639-1. When a twochip Sound Module is placed in a STAR set, the result is "nosound".

The Magnavox Parts Division stocks the 703639-1 as auniversal replacement Sound Module for all T995 chassis.

Color TV Chassis T989-Black Shadow On Screen

A black shadow on the CRT, usually appearing in theupper right portion of the screen, can be eliminated withthe addition of a jumper wire to the chassis from the Verti-cal Oscillator/Driver module on the "D" panel. The jumperis soldered to the ground land at the junction of R3 and C2on the module. The other end of the jumper is attached to

the chassis frame as shown in the illustration. The jumperplus instructions will accompany all replacement "D"panels and Vertical Oscillator/Driver modules.

Color TV Chassis 1985/986-Poor Reception On Low VHF Channels With

Built -In Antenna

This symtom may be due to the built-in rabbit ear an-tenna. The solution is to replace the antenna with a PartNo. 701315-19. The two elements of the replacement an-tenna each have eight sections and extend to 48 inches. Inaddition, the two elements can be separated 180 degreesapart. The full 180 degrees separation is desired for bestreception on low VHF channels.

Low cost tool for designand trouble -shootingPocket SizeSlide -SwitchResistanceSubstitution Unitstill only $58 Over 11 million step range 1% accuracy resistors Unique in convenient size Rugged constructionSmall enough to take anywhere in your pocket, this aluminum -housed unit delivers a very broad range of resistance steps.Excellent for both development and repair work.

Half -watt 1% tolerance resistors give an accurate range from1 to 11,111,110 ohms, in one -ohm steps. Has three bindingposts, one to ground case.

Available now from stock. Catalog No. 7092-236. Cash savingsavailable, see coupon. Write, or call (804) 264-2858. Phipps & Bird, Inc.

Please send Units $58 each. (Check enclosed less 5%cash discount)

Send Units @ $58 each C.O.D. (Phipps & Bird will payC.O.D. charges)

Name

Firm

Address

City, State ZipAsk your dealer, or contact:

1)1170X)0 3.1:31:112D,um.Manufacturers of Scientific Instruments

P.O. Box 27324 Richmond, Virginia 23261 Phone: 804/264-2858


JANUARY 1976, ELECTRONIC TECHNICIAN DEALER 25

Servicing CB PowerSupplies

By David Norman, ET/D Communications Editor

This is the first of aseries aimed at helpingtechnicians understandtypical circuits used inmodern CB transceiversand thus enable him toquickly locate and repairproblems in less timethan it has been taking.

It is our premise thatmost circuit problemsare basically simple tosolve if you know how thecircuit works. Actualtheory is not nearly asimportant to the "work-ing" technician as is hisability to keep all repairs"on the clock." Of course,it would be all but impos-sible to make a living intwo-way communica-tions if you knew notheory, but we feel thatone of the best ways tolearn is to do.

The circuits used inthis series are not in-tended to represent ac-tual circuits used in anyunit currently beingmanufactured. In fact,many of them would noteven work as depicted. Insome cases, they aremade more complicatedthan necessary in orderto relate as much infor-mation as possible in theavailable space. In othercases, the circuits havebeen greatly simplifiedto teach as much as pos-sible with the leastamount of verbage.Hopefully, the conflictbetween actual and illus-trated circuits willneither confuse you norelicit too many lettersexplaining why a circuitcan't possibly work.

DC -INPUT SUPPLIES

By far the best sellernationwide, the 12 VDCmobile unit, is also the

one that you will seemost often on the bench.Besides the obvious factthat there are more ofthem than anything else,mobile units are sub-jected to more abuse thanwould be a base stationin the same system.

Probably the mostcommon CB complaint is"the unit blows fuses."An analysis of the circuitin Fig. 1 will reveal sev-eral reasons why.

When switch SW1 isclosed, the battery volt-age instantly appearsacross protection diodeDl. If the polarity of thepower leads is correct, allis well. However, all toooften, someone hasgoofed (hopefully not thetechnician) and reversedthe polarity. In this case,diode Dl performs its de-sign function and pre-sents a short circuit tofuse Fl. The idea, ofcourse, is for fuse Fl toblow before anything isdamaged. Usually itworks.

The problem is thatpeople who are prone toreverse power leads arealso prone to over -fuse oreven "straight wire" aunit. In either case, diodeD1 is usually damaged(normally shorted) andmust be replaced if pro-tection is to be restored.In extreme cases, diodeD1 will burn and open.When that happens, re-pair bills go up.

Choke Ll and bypasscapacitor Cl form a low-pass filter; their valvesare selected so that theykeep RF noise out of theB+ bus.

Choke L2 and elec-trolytic capacitor C2 aredesigned to remove audio

L2

12VDC0-

R1

REGULATEDB+

DZ1

Fig. 1-Typical power supply circuit employed in CB units powered directlyfrom storage batteries or other DC source.

frequency "hum" or al-ternator "whine" fromthe B+ line.

Resistor R1 drops thevoltage appearing acrossZener DZ1 by acting as avoltage divider with thecircuitry on the regu-lated B+ line.

If polarity protectiondiode D1 is burned open,immediate failure ofchoke Ll, electrolytic C2,resistor R1, and ZenerDZ1 is possible and evenlikely. Choke L2 is usu-ally pretty heavy and C2is usually rated at a highvoltage.

After cleaning up themess in the power supplysection, you may stillhave considerable dam-age in the rest of the unit.Fortunately, diode D1does its job unless thefuse is super high in rat-ing or non-existant.Electrolytics can blow(literally) if subjected toreverse or overvoltage,and such damage is usu-ally quite obvious.

Lightning can destroyZener DZ1, even if therewas not a direct hit.

As a general rule, fail-ure of DZ1 doesn't do anyother damage. Such fail-ure might cause IF in-stability or oscillation orimproper squelch opera-tion. Of course, if theZener shorts out, theoverall gain of the re-ceiver might be signifi-cantly reduced.

A power supply simi-lar to Fig. 1 is usuallyeasy to troubleshoot.Continuity checks with aVOM are about all that isrequired. Because fail-ure in this type of circuit

is almost always causedby abuse or carelessness,diplomatic instructionsto the customer mightprevent a recurrence.

DC/AC-INPUT SUPPLIES

Fig. 2 is an example ofa "budget" AC -to -DCpower supply. A CB unitdesigned for operationfrom either a 117 VAC or12 VDC might contain acombination of Figs. 1and 2, or something simi-lar. In an actual CB set,more than one transistorwould probably be usedin the regulator circuit.

You will note that Fig.2 shows the fuse in theprimary circuit of thetransformer. This is atypical practice. A deadshort in the secondarycircuit will blow a prop-erly rated fuse, but some-times the delay is toolong. Without data to thecontrary, it is reasonableto assume that the "hot"primary design affordssome spike protection tothe filter circuit.

In the example in Fig.2, a diode bridge is used.A center -tapped trans-former using two diode infull -wave configurationis also quite common.

Capacitor Cl is anelectrolytic, as arecapacitors C2 and C3.Resistor R1 limits cur-rent through Zener DZ1,which provides a more orless constant referencefor transistor Ql. Resis-tor R2 is merely a load forQl, and in many caseswill not even be in thecircuit.

The circuit in Fig. 2provides good regulation


Fig. 2-Simplified version of the regulated power supply circuitry typicallyemployed in CB units designed for operation with either AC or DC input.

of the output voltage, as-suming that the changewhich requires regula-tion originate in the load.This supply regulatorwill not compensate forexcessive swing of theprimary voltage.

This example shows anNPN as Ql; you are justas likely to find a PNPbeing used in the nega-tive side of the B+ sup-ply.

Most failures in thistype of circuit are causedby a short or "near short"across R2 (output), or byfailure of one or morediodes in the bridge,

which, in turn, is usuallycaused by one of the filtercaps becoming "leaky."

If lightning or anyother type of power surgein the primary causesDZ1 to open up, failure ofQ1 is apt to follow. If nodata is available regard-ing the exact value ofDZ1, replace it with a1 -watt or higher unitwith the same breakovervoltage as the nominaloutput of the supply(probably 12 to 14 VDC).The regulator transistoris usually mounted on aninsulated heatsink andcare should be taken to

see that any replacementis carefully mounted.

If DZ1 should be founddefective, check R1 to becertain that it is still inthe ballpark-probably500 to 1000 ohms.

When several transis-tors are used in a reg-ulating circuit and one isbad, check all of them be-fore restoring power.

If the unit contains anadjustment for settingthe output voltage, don'tsuccumb to the tempta-tion to crank up the RFoutput by increasing theoutput voltage of thepower supply. You mightget your customer a cita-tion and you very likelywill have to go back andrepair the unit, perhapsat your own expense.Many of the CB SSB basestations are capable ofwithstanding the highervoltage stresses causedby such adjustment-butonly for a while.

Anytime that you re-

quire a replacement for afilter capacitor, be cer-tain that the actual volt-age present in the supplydoes not exceed the work-ing volt (WVDC) ratingof the replacement. Youcan get by with selectinghigher WVDC, but neverselect a lower one.

When failure of apower supply componentleads you to believe thatexcessive current isbeing drawn by the unit,look closely at the audiooutput/modulator sec-tion. Most audio outputcomponents are con-structed with heavyleads and can carry theexcessive current causedby a short for several sec-onds or longer withoutvisible damage. Waxunder the audio outputtransformer is one of thetelltale signs of excessivecurrent for which youshould look.

Next month: CB audiocircuits.

FOR INNOVATIONS IN LOW-COST TEST EQUIPMENT, THINK HP

Here's a professional 80 MHz counter for $295:The HP 5381A counter covers 10 Hz to 80 MHz andcombines economy with lab quality and performance:Sharp seven -digit LED readout. High stabilityinternal time base. 25 mV sensitivity. Three -positioninput attenuator. External oscillator input. Ratiomeasurement capability. Extremely rugged castaluminum case.Ideal for applications such as production line testing,service and calibration, frequency monitoring,education and training.

Go to 225 MHz for just $4951The HP 5382A has all the features of the 5381A,plus 8 digits and a 225 MHz frequency range.

Or go all the way to520 MHz for $7951The new HP 5383A does it. You get 9 digits, fused inputand direct counting as well.All three come with full instrumentation warranty, fullservice support; all meet IEC safety specs. For moreinformation call your nearby HP field engineer. Or, write.

024060 *Domestic USA prices only.

"i /_/. Li 1 1 i_i

GATE

z

ATTENUATOR

INPUT

"Co

UrD5381A 80MHz FREQUENCY COUNTER NEWLET TPACKARO

_--F -HEWLETT a 1 PACKARD

Sales and service from 172 offices in 65 countries.1501 Page Mill Road, Palo Alto. California 94304



COMM CHAT

With David Norman, ET/D Com-munications Editor

Those of us involved with two-way communications equipmentoften forget that only a relativelysmall part of the radio spectrum isused for such purposes. Some-times, we even consider our par-ticular "turf' or specialty the onlyone that counts and the otheruses merely infringement. Well,there's a whole 'nother world outthere.

Analysis of the entire spectrum(known spectrum, that is) would(and has been known to) fill sev-eral volumes. About the best thatwe can do here is to briefly reviewin a broad, general manner someof the characteristics and uses ofthe most common segments of thespectrum.

The various parts of the radiospectrum are designated broadlyby frequency range (Fig. 1). Re-membering that not all frequen-cies in any given category (band)have exactly the same propaga-tion characteristic, (for example,30 MHz is quite different from 300MHz), let's take a look at each ofthese bands from the standpoint ofpropagation expectations.

The LF band (30 KHz to 300KHz) is useful for extremely reli-able communications over greatdistances. The only real limitationon range in this band is availabletransmitter power; to achieve longrange communication in the LFband requires lots of power. Manyof these transmitters are in the

Megawatt class. The other pre-requisite is a monstrous antennasystem, mostly buried under-ground.

As we move up in frequency tothe MF band, (300 KHz to 3000KHz) communications over hun-dreds and even thousands of milesare possible with moderate power.(AM broadcast stations are in thisband.) Direct groundwave cover-age is relatively short on a con-tinuous basis and is subject to at-mospheric electrical interference.At night, skywave coverage dou-bles or quadruples range, requir-ing either "clear channel" regula-tion or power reduction (or both).

Most long-range (over 100miles) and some local two-waycommunications take place in theHF band (3 MHz to 30 MHz). Asfrequency is increased in thisband, range for a given radiatedpower increases, up to 25 MHz ortherabouts, but the usable time ofeach day for long-range communi-cations decreases. As frequencyincreases, predictability of propa-gation also becomes less reliable.

The HF band is used heavily byinternational broadcasters, ama-teurs, military groups (foreignand domestic), private industry,and vessels of all types. Within theHF band is contained a large partof the world's most exciting com-munications, including the ClassD portion of the Citizens RadioService. In an effort to relieveovercrowding in this band, thetrend internationally has beentoward SSB, RTTY, and othermodes which reduce the requiredbandwidth and allow more chan-nels in a given portion of the spec-trum.

Everyone wants a piece of theHF band because of its uniquequality-the ability to transmitinformation over thousands ofmiles with low -power stations(many under 1 kW) utilizing rela-tively unsophisticated equipment,yet with a good degree of reliabil-ity. None of the other "bands" caneven come close.

Another band being used heav-ily, particularly in the U.S., is theVHF band (30 MHz to 300 MHz).The bottom part (30 to 50 MHz)exhibits some of the characteris-tics of the HF band (skywavepropagation) in a somewhat un-predictable manner, but overallthe VHF really "shines" in its abil-

ity to provide very reliable short-range communications with mod-est power requirements. Superef-ficient antennas require littlespace in the VHF band, particu-larly in the upper portions. Withthe advent of transistors capableof handling a hundred watts or soof RF power, small, highly effi-cient transceivers began findingtheir way into hundreds of differ-ent applications. This compact-ness is ideally suited for mobile -to -mobile and base -to -mobiletwo-way communications.

The VHF band is almost com-pletely immune to atmosphericdisturbance, and when FM is usedas the transmission mode, it is al-most completely immune toman-made electrical noise.Ranges of more than 100 miles areeasily obtainable, depending moreon antenna height, terrain, andantenna gain than actual trans-mitter power. The VHF band con-tains most of the Public Servicechannels, the VHF TV channels,FM broadcast, the Marine VHFband, Aviation Com-Nav chan-nels, three amateur bands, and ahost of other private and publicapplications. Even with a bandthat is 270 MHz wide, crowding isbeginning to be a problem, mostlyaround the large metropolitanareas. Answers to this crowdingare being provided by newtechnology in the form of high-speed bursts of information, whichtake up less time on a given chan-nel for a given amount of data, andnarrow -band modes of transmis-sion, which permit more channelsin a given portion of the spectrum.It is not unreasonable to assumethat at some future date a 20-KHzportion of the band will carry adozen voice channels rather thanonly one. Perhaps it won't soundas good as it does now, but it willstill do the job.

The UHF band (300 MHz to3000 MHz) is the highest and thelast band we will examine. Thelower portion of the UHF band isvery similar both in propagationand uses to the upper portion ofthe VHF band. However, aboveabout 500 MHz or so, things startgetting exotic. A capacitor may bemore of an inductor than anythingelse, and most tuned circuits arecarefully machined boxes. Klys-trons and magnetrons and

continued on page 49


"This is wherewe separate thewinners fromthe losers."Sylvester Herlihy, PresidentChannel Master, Division of Avnet, Inc.

If antenna installation is your business, we thinkyou would like to see where the most powerfulweapons in the fight for better reception are created.

In the world of Antenna Science, there is only oneChannel Master Development Laboratory. Its ac-complishments are the envy of the industry.

For 27 years, since the earliest days of commercialTV and FM broadcasting, this Lab has been thebirthplace and testing ground of the world's mostadvanced antennas, boosters and accessories.

The Channel Master Lab is the reason we have beengranted more US Patents than any other antennamanufacturer. It's why we can design them better...test them better...build them better. It's also theplace we make our mistakes. If a new design doesn'twork out, we find out in the Lab, not on your roof.The lemons and losers never make it out the door.

Put your confidence in Channel Master's antennascientists. They are uncompromising. Thanks tothem, you're always sure that a Channel Masterantenna will perform just as we say it will.

That's why Channel Master antennas are the mostfamiliar shapes on the rooftops of America --the per-formance pacesetters --installed by more profession-als than any other brand.

Channel Master Antenna ScienceThe creative power behind every installer. We keep your business growing profitably.


TECHNICALLITERATURE

POWER RECTIFIERS

A 4 -page brochure explaining aninnovative approach which permitsindustrial companies and distributorsto eliminate power rectifier replace-ment delays and how to reduce inven-tory stock is now offered. Listed are 16basic rectifiers with general specifica-tions and provides an extensivealpha -numeric cross reference chartcorrelating the International Rectifierbasic part numbers with JEDEC andother manufacturer numbers. Thecross reference chart permits a rectifi-er user to assess quickly the suitabil-ity and potential value of the Basic 16program to his requirements. Interna-tional Rectifier, 233 Kansas St., ElSegundo, CA. 90245.

SPEAKER/MICROPHONE STAND

An 8 -page loudspeaker catalog,Form 7602, provides complete specifi-cation data plus application recom-mendations for a product -line includ-ing the AP -series omni-purposespeakers, indoor/outdoor music units,decor speakers, professional soundsystem components, Columnair soundcolumns, heavy duty industrialspeakers, life -safety system andmobile communications speakers. De-tailed in a 4 -page, Form 7601, micro-phone stand catalog, are a full range ofstage, studio and general purposestands, boom stands, loudspeaker anddesk stands, plus the largest assort-ment of microphone stand accessoriesand adapters. Atlas Sound, Division ofAmerican Trading and ProductionCorp., 10 Pomeroy Road, Parsippany,NJ. 07054.

ULTRASONIC CLEANING

A 20 -page booklet provides practi-cal "how-to" information on the use ofbench -top ultrasonic cleaning units inrepair shops, laboratories and man-ufacturing plants. It tells how andwhy ultrasonic cleaning works and il-lustrates two basic cleaning methodsand discusses selection of cleaningagents and use of accessories. ServiceDepartment, American ElectricalHeater Co., 6110 Cass Ave., Detroit,MI. 48202.

CLOSED-CIRCUIT VIDEO EQUIPMENT

A 8 -page product guide covering aline of general purpose, high perform-ance cameras and video products isnow available. The general purpose,

low cost cameras include the TC1000family used widely for surveillancesystems. The high performancecameras cover the TC1005 family forCCTV, CATV, MATV, braodcast anddemanding industrial use. In addi-tion, the booklet lists VTR camerasand CCD cameras. Other video prod-ucts include monitors, accessories, asequential switcher, a date and timegenerator, and VidAlert motion detec-tors. The publication "General Pur-pose, High Performance Cameras andVideo Products", CCV-118, provides aquick overview of your CCTV systemproduct needs. RCA Closed CircuitVideo Equipment, Lancaster, PA.17604.

RECEIVING TUBE MANUAL

A new 754 -page RCA ReceivingTube Manual No. RC -30 is now avail-able. Like its predecessors, it has beenwritten for engineers, service techni-cians, educators, experimenters, andothers interested in electron tubes andtheir applications. It includes chap-ters on the basic principles of opera-tions of electron tubes as well as theirsignificant electrical characteristicsand circuit applications. Technicaldata are included on active as well asdiscontinued tube types. Among themany other valuable features of thebook are tube terminal diagrams, apicture tube characteristics chart andan expanded updated replacementguide for entertainment and industri-al receiving tubes. The manual has asuggested list price of $2.95, plus 500postage and handling charge. RCADistributor and Special Products Divi-sion, P.O. Box 85, Runnemede, NJ.08078.

THYRISTORS AND RECTIFIERS

A 376 -page technical manual thatdescribes basic theory, performancecapabilities, and circuit applicationsof thyristors and silicon rectifiers isnow available. The RCA Thyristorand Rectifier Manual, TRM-445, is in-tended as a guide to the selection anduse of silicon rectifiers and thyristors(silicon controlled rectifiers andtriacs) for a variety of power controland switching functions. The manualcovers general physical theory, ther-mal considerations, packages, han-dling and mounting, maximum rat-ings, electrical characteristics, andcircuit applications of thyristors andrectifiers. It also provides an up-to-date listing, together with brief de-scriptive data, of thyristors and recti-fiers currently available from RCA.Device selection criteria are ex-plained, design examples are shownand described, and performance dataare given for a broad range of circuits,including DC power supplies, voltage

regulators, converters and inverters,AC power controls, TV horizontal de-flection circuits, and electronic igni-tion systems. Copies of the manual areavailable at $5.00 each (optional dis-tributor price). RCA Solid State Divi-sion, Box 3200, Somerville, NJ. 08876.

MEASURING PARAMETERS OFAUDIO PRODUCTS

A 16 -page brochure discusses thevarious types of distortion that occurin audio amplifiers, tape recorders,equalizers and loudspeakers. Methodsof measurement are shown. Fre-quency response measurements ofthese products are explained in detail.How to use low -frequency wave andspectrum analyzers to measure distor-tion, frequency response, wow andflutter, signal-to-noise ratio and crosstalk of high -quality products is de-tailed in a new application note. Ananalyist of harmonics in musical in-struments illustrates the use of thespectrum analyzer in synthesizingvoices of various instruments. Sec-tions are devoted to acoustic responseof rooms, signal-to-noise ration andcross talk. Application Note 192,Using a Narrow Band Analyzer forCharacterizing Audio Products' isavailable free of charge. Hewlett-Packard Co., 1501 Page Mill Road,Palo Alto, CA. 94304.

SPEAKERS

A 12 -page catalog listing 127 differ-ent speakers is published. The catalog,"Quam76, The Sounds of America,"lists general purpose, automotive,high fidelity, music instrument, andsound system speakers, as well asmatching transformers. All thespeakers listed in the catalog arestocked by Quam's distributor net-work. In addition to the standard unitslisted, the catalog describes specialmodification services available. Com-plete price and ordering information isincluded in a simple, easy -to -readformat. Quam-Nichols Co., 234 EastMarquette Road, Chicago, IL. 60637.

POWER TRANSISTORS

An updated and expanded 44 -pageedition of the RCA Power TransistorDirectory, PTD-187E, is now availa-ble. The catalog lists the power trans-istors and power hybrid circuits cur-rently available, and provides selec-tion charts and significant data on thedevices. Applications information, alist of transistors which may be usedas complementary pairs, and chartsshowing high -reliability and mili-tary -specification types of powertransistors are also listed. RCA SolidState Division, Box 3200, Somerville,NJ. 08876.


TO: JOE RIDGEWINEGARD SALES IAA-SAGER

*FIRSTSAYRTSM YIELD REALLY PANTASTIC

INSTALLERSSWE RAVE A REAL WINNER IN

CRROUSTAR--140REPOWERFUL, PERFORMANCE,

ESPECIALLY

1.311F- -STRONGESTANTENNA EVER BVILT --ASIER

INSTALLATION.ACCEPTANCE

AND DENANDRIG% AND

GROWING . . . WEEPCOILING!

DISTRIBUTORSPLEASED TT

DEALElk REACTION, AND

RAP -9Y WITR NEW , COILPAC CARTON SIZES. SET

OWNERS GEING INSPICTVRES, BETTER COLOR

FROM ALL STATIONS IN I-kANGE.AU SENDING 10\1

ACTUAL DEALERSTATEMENTS.

Imo RIDDLExAsTRICT MAN WAR

Dealers Everywhere Welcome CHROMSTARFirst New TV Antennas In Years.Response has been totally enthusiastic because of themany far -ahead features built into Chromstar models!

New Standard of Excellence In Constructionand Performance.

Anodized and Ruggedized for WeatherProtection, Long Life.

New Tri-Linear UHF Director System IncreasesGain Up To 30%

Models To Solve Every Reception Problem.GET ALL THE FACTS FROM YOUR WINEGARD DISTRIBUTOR.FREE SPEC CHARTS ON ALL MODELS. CASH IN WITHCHROMSTAR SALES AND INSTALLATIONS!

CH -7080VHF -UHF -FM

CH -9085UHF only

WINEGARD®COMPANY3000 Kirkwood Burlington. Iowa 52601

TV ANTENNAS MORE PEOPLE LOOK UP TO.

CH -8096VHF -UHF -FM

1



TESTINSTRUMENT

REPORT

B & K Transistor Tester Model 520. For moreinformation about this instrument circle 105 onthe Reader Service Card.

B & K TRANSISTORTESTER MODEL 520

Practically all electronic prod-ucts now employ complex solidstate circuitry. Many of us are notexperts in transistor theory,transistor basing or understandsome of the circuit in which thetransistor is used.

If you now employ the oldmethod of removing the solid statedevice for testing, you are not onlyspending valuable servicing time,but are taking the risk of damag-ing the component or circuit boarditself.

The B & K Transistor TesterModel 520 is designed for in -circuit transistor testing, withspecial features for making addi-tional tests for devices out -of -circuit.

This instrument employs themanufacturer's Dynapeak systemwhich allows accurate testing oftransistors in low impedance cir-cuits. Reliable testing of a transis-tor in -circuit depends upon appli-cation of a base test signal at alevel of least equal to thethreshold of forward conductanceof the device, or the transistormust be turned on. This voltage isapproximately 300 millivolts forGermanium and 700 millivolts forSilicon devices. To develop thismuch voltage across the devicewhile it is shunted by low resis-tance or high capacitance, thegenerator must have several voltsoutput and its internal series im-pedance must not be too large. It

must be able to supply high cur-rent for a short period of time.

The testing system appliesenough peak test voltage in thecommon low resistance shunt cir-cuit to "turn -on" a silicon devicewith ample margin, while thevoltage available from the base toemitter from a continuous squarewave type transistor tester is lessthan one -tenth that required.

The system applies power withonly a five percent duty cycle, themaximum energy applied to ajunction is less than one -tenth ofthe maximum safe level.

A short test pulse is applied onlyten times per second and the de-tector in the tester processes thedigital information and converts itto the continuous tone and LEDdisplay. You can perform a seriesof tests almost as fast as you canattach the leads.

Other Tests Performed

1) Determines good or baddiodes in or out of circuit. 2) Base,collector and emitter identifica-tion. The base (or gate) lead is au-tomatically identified by the colorin the window on the instrument'sfront panel. Collector and emitter(source and drain) leads are alsocolor identifiable. 3) Indicates thepolarity of good devices (NPN orPNP). If a good device is PNP, thePNP LED on the front panel of theinstrument will illuminate; ifNPN, the NPN LED will illumi-nate. 4) Automatic Silicon/Germanium identification. It isautomatically displayed when youturn the identity switch and theproper Silicon or Germaniumlight on the front panel will il-luminate. 5) Measure ICES or IBESof transistors. 6) Measures IDSS ofFET's. 7) Measures gate leakageof FET's. 8) Measures reverseleakage current of diodes. 9) De-termines whether the device isbipolar, FET, or SCR.

Testing Transistors/FET's (In -circuit)

The three locking, color codedtest leads can be connected in anymanner to the three leads of thedevice you wish to test. Also, thedevice can be plugged into theconvenient test socket on the frontpanel of the instrument in anymanner for out -of -circuit testing.

Then the test switch on the frontpanel is moved through its six po-sitions until the tone is heard.

With most transistors and FET's,the tone will be heard in two posi-tions. Transistors have some gainwhen the collector and emitter areinterchanged and most FET's aresymmetrical. If the tone is heard,one of the two red indicators willlight up indicating whether thedevice is NPN or PNP. If no tone isheard in any of the six switch posi-tions, the device is probably defec-tive.

If the device tests bad in -circuit,the test can be verified by remov-ing the device from the circuit andtested out -of -circuit.

Testing Bipolar Transistors(Out -of -circuit)

To test Bipolar transistors, theinstrument is set up in a similarmanner as testing transistors/FET's in -circuit. Now leakagetests can be made without refer-ring to charts. Turn the functionswitch to leakage position and notethe meter indication. Hold thefunction switch in the leakage po-sition and move the test switch tothe other position (the position atwhich a tone was heard), whichdisplays the same color in the basewindow. The leakage should beabout equal in both test positions,and within the limits shown on themeter scale. In one of the posi-tions, the meter indicates ICES; inthe other IEBS. To determine whichmeasurement is being made, thecollector and emitter of the tran-sistor must be identified.

The leakage indicated can bethen compared on the logarithmicmeter scale which reads in micro -amps and milliamps. Leakagelimits are shown directly on thescale for each type of device; Ger-manium or Silicon and power orsignal.

Specifications

Applied Test Currents:Collector Current: 250 ma at 5 per-cent duty cycle. Base Current: 125ma at 5 percent duty cycle. TestRepetition Rate: 10 per second.Reverse Voltage For Leakage Test:3.5 volts.

Limiting In -Circuit Shunt

Values For Good/Bad Test: Resis-tance: Greater than 10 ohms.Capacitance: Up to 5 mfd with lowbeta devices, up to 15 mfd withhigher betas.

The instrument measures 8


inches by 7 inches by 31/2 inchesand weighs 5 lbs. Price is $150.

RCA DUAL -TRACER MODEL 541A

Many of us may own a goodtriggered or recurrent -sweep os-cilloscope, but would like to adaptthe instrument for dual -tracewaveform observation at a mini-mal cost.

The new RCA Dual -TracerAdapter can be quickly attachedto any triggered or recurrent -sweep oscilloscope for dual -traceoperation. If the unit is used with adual -trace oscilloscope, you will beable to view three traces.

With the dual -trace capabilityprovided by the instrument, youcan now use your single trace os-cilloscope for applications such asmaking comparison tests of gain,frequency response, distortion,phase shift, and time delay.

The wide frequency response ofthe instrument permits displays ofhigh frequency patterns such asTV video waveforms. A frequencycompensated six -step attenuator(1, 2, 5 ratio) is provided for eachchannel, along with the selectionof AC or DC coupling. Vertical po-sition controls for each channelare included on the front panel ofthe instrument.

Display modes of the instru-ment are Channel A only, Chan-nel B only, or both A and B chan-nels simultaneously ("chopped" or"alternate"). The alternate modeis used for most applications, withthe chop mode used to display onlylow frequency waveforms. An im-portant feature is the instru-ment's continuously variableswitching frequency range to re-duce flickering and beat interfer-ence. Another equally importantfeature is the Channel A sync out-put with variable level and choiceof sync polarity.

The Dual -Tracer operates on aprinciple similar to that used in"built-in" dual -trace oscilloscopes.

RCA Dual -Tracer Model 541A. For more information about this instrument circle 106 on theReader Service Card.

A square -wave switching signal isgenerated by the instrument. Inthe chopped mode, the signal ischopped into small segments, dis-playing every other segment foreach channel. This circuit opera-tion provides displays with signalfrequencies that can be viewedwith the scope sweep set to thelower frequencies below approxi-mately 200 Hz. As the sweep speedbecomes higher, the waveformwill break into the chopped seg-ments, making this mode unusa-ble.

In the alternate mode, the pat-tern is alternately switched fromone display to another after eachentire sweep cycle. The alternatemode provides patterns when theoscilloscope sweep is set to displaywaveforms above approximately200 Hz. The alternate mode isusually the most useful functionbecause it can be used with all butvery low signal frequencies. Whenswept at low frequencies in the al-ternate mode, the display willbreak up displaying the Dual -Tracer square wave switchingsignal.

There is sufficient range of fre-quency adjustment in both modesso that intermediate signals in the100 to 300 Hz range can be viewed.

Set -Up

The unit only requires two con-nections to the oscilloscope, Fig. 1.The output cable from the back ofthe Dual -Tracer is terminatedwith a BNC connector and is con-nected to the vertical input of theoscilloscope. Its sync output jackon the front panel is connected tothe external sync connector of theoscilloscope.

Calibration and Voltage MeasurementPeak -to -peak voltage mea-

surements can be made by cali-brating the Dual -Tracer and oscil-loscope combination. This proce-dure involves applying a calibrat-ing signal through one channel ofthe Dual -Tracer, then adjustingthe Dual -Tracer attenuator andoscilloscope vertical gain controlsto establish a given peak -to -peakvoltage for each reference division(centimeter, inch, full-scale, etc.)

Electrical Specifications

Frequency Response: Usable DCto 10 MHz Input Impedance:1 Megohm shunted by 55 pf

Maximum AC Signal Input: 50volts peak -to -peak (500 voltpeak -to -peak with 10 X probe)Maximum Signal Output: 1 voltpeak -to -peak Noise Level: Lessthan 10 millivolts.

The Dual -Tracer employs thelatest COS/MOS integrated cir-cuitry and zener-regulated powersupply with LED power -on indi-cator. The price is $108.

NLS RMS Measurement Probe Model RMS-10.For more information about this instrument cir-cle 108 on the Reader Service Card.

NLS RMS MEASUREMENTPROBE MODEL RMS-10

Non -Linear Systems introduceda new, low cost, portable batterypowered probe for the measure oftrue RMS. The probe has threeranges, 2, 20 or 200 volts, fullscale. It has a DC output signal of0 to +2 volts DC, which representsthe RMS value of the input,whether DC, AC or a combinationof either. The DC output can beread by any voltmeter having a 0to +2 volt DC range, such as theNLS Model ML -3.5 Digital Mul-timeter. Accuracy of the conver-sion is +1 percent. Input impe-dance is 1 megohm and response is-3 dB at 10 KHz.

The probe operates from its ownself-contained NiCad batteries.The batteries and a charger unitare included. It measures 1.4inches in diameter and 7 incheslong. Price $149.M


1969-70 vintage.

Recurring FailuresIn Car RadiosSymptoms and causes of some of the mostcommon defects By Joseph J. Carr, ET/D VehicularElectronics Editor

As in most other types of elec-tronic products, certain compo-nents and devices in car radiosseem to fail more frequently thando others. Also, certain basic cir-cuit designs, some of which areused in a number of differentbrands and/or models of car radios,seem more prone to certain typesof failures than do others. In thisand subsequent "reports" aboutrecurring failures, I will informyou not only of the specificsymptom(s) and cause(s), but alsothe basic circuit designs in whichthey seem to occur most often.

BENDIX AUDIO POWER AMP

The circuit in Fig. 1 is an audiopower amplifier used in Bendix-designed Ford AM/FM Stereo re-ceivers of the 1969-70 era. Similarcircuitry is also used in Bendixradios of other years and in radiosproduced by other manufacturers.Actually, this circuit design can betraced back to the 1967 Volks-wagen AM receivers, which werethe first 12-VDC VW radios. The"common feature" in this series of

radios is Q3, the NPN audio powertransistor.

Audio Power Transistor

Transistor Q3 is usually a tab -mounted, plastic, P-66 type. In1969-70, Ford Galaxy and LTDradios, this transistor is mountedto a Vs inch -aluminum plate whichserves both as the heat sink for Q3and as the rear cover for the radio.Although this same mounting ar-rangement for Q3 is used in manyother models, in a few models, Q3is mounted on the heavy cast -metal front escutcheon above thevolume control.

The first indication of a defec-tive power transistor comes whenyou first turn on the receiver.Normally, there should be a sharp"click" or "thump" and the re-ceiver should begin to drawslightly more than 1 ampere of"A -line" current. However, if Q3 isdefective, neither will occur andthe audio, if present at all, will beweak and distorted.

In audio power amplifiersequipped with a PNP Germanium

CI

AUDIOFROMVOLUMECONTROL

0 +10.5 VDC

R1

180K

R268K

R3857NTC

R5680

R42.2K

01

R610K

R7330

0 02 AUDIOOUTPUT

R10470 n

C2ICI 1000MFD

4WVDC

R8560

03

R9220,

TO IISPEAKER

T2

0 14VDC

power transistor, collector -emit-ter leakage is the usual failuremode. However, with the P-66class of NPN Silicon transistor, anopen base -emitter junction is themost common cause of failure.Normally, the base -ground volt-age of Q3 is between 2.5 and 3volts. When the base -emitter junc-tion opens, it causes the base volt-age to increase to a level closer tothat of the collector.

Transistor Q3 in Fig. 1 can bereplaced with an OEM P-66 typefrom Bendix or, if necessary, youcan replace it with a substituteplastic -case type from Motorola(HEP), General Electric (GE),Sylvania (EGG), RCA (SK), Inter-national Rectifier (IR) or any ofthe semiconductor replacementlines. When selecting a substitute,pay particular attention to thephysical design; because someplastic -case substitute types havedifferent mounting dimensionsthan the OEM version, they mightnot fit as conveniently as you de-sire.

Another alternative type whichI have used in many instances inplace of the P-66, is either a TO -3or TO -66. The mounting plate ofmost radios which are factoryequipped with the P-66, are al-ready drilled to accept either theTO -3 or TO -66 types. (In most, thescrew which holds the tab of theP-66 type uses one of the holesdrilled for the TO -3 or TO -66.)

Another recurrent (althoughrarer) defect related to Q3 in Fig. 1is a fault in the insulator which issupposed to prevent the collectortab from coming in contact withground. The fault in the insulatorgrounds the + 14-VDC source,thereby destroying the audio out-put transformer.

Audio Bypass Capacitor

When you encounter a Bendixradio with weak audio, normal

- -Fig. 2-Top view of the circuit board of Bendix-

Fig. 1-Audio power amplifier circuit used in some Bendix-produced AM/FM stereo car radios of made Ford AM/FM stereo radio of late '60s early'70s vintage.

34 / ELECTRONIC TECHNICIAN/DEALER, JANUARY 1976 For more information on Weston circle 128 on Reader Inquiry Card:-.-

Now buy the wEsToN-"Drop-Proofed"champ on your credit card*

*Offer good for MASTER CHARGE and BANK AMERICARDonly. Allow 2 weeks for delivery.

For the first time, an opportunity to get the Weston"Drop -Proofed" VOM on your credit card ...andhave the meter of your choice drop -shippeddirectly to you. Save time and energy.

Weston will send any VOM in the 660 series onyour Master Charge or Bank Americard.

These are the units you have seen and heardabout. The Weston VOM, widely known in the in-dustry for reliability, accuracy, ease of operation,and warranted "Drop -Proofed" construction as-sures proper functioning even after an accidentaldrop of up to five feet.

All you have to do to get the "Drop -Proofed"leader is to fill out the card at right-completely,please-and return it. You don't even need a stamp.Weston has made the card postage -free.

If you wish, you can send a check or moneyorder. Be sure to indicate on the card the methodyou prefer.

Waste no more time getting the "Drop -Proofed"VOM you've always wanted but just haven't hadthe chance to buy. Now, it couldn't be easier.

106 5 VALID'flEIERT E

Please send me the WESTON 660 VOM"Drop -Proofed" Champ

Name

Address

City State Zip Code

Model 660 661 662 663 666Price $79.00 $91.00 $122.50 $135.00 $164.00

Quantity ( ) ( ) ( ) ( ) ( )Add $2.00 for handling charge. (New Jersey residents add 5% salestax to cost of unit.)

Total amount of purchase $PLEASE CHECK ONE

0 MASTER CHARGE 0 BANK AMERICARD

MONTH YEAR

INTERBANK NO. EXP. DATE

0 Payment by check 1:1 Payment by money orderOffer effective through Mar., 1976.

See specifications on reverse side.Signature

General Features Completely drop -proofed Custom ruggedized self -shielded taut -band mechanism Diode -protected meter movement Temperature compensated Unique pluggable circuit board assemblies Special calibrated scales for dB measurement Circuit recalibration without case disassembly Quality components used throughout External fuse replacement

All controls flush with edge of case Single range switch

Self -storing handle Input terminals spaced for use with double banana jacks

Specifications

-11111111111111.11.11111111111111invie.

MODEL 660 MODEL 661 MODEL 662 MODEL 663 MODEL 666

Accuracy 2% DC (1.5% on 50 ua range)3% AC

1% DC2% AC

2% DC (1.5% on 50 ua range)3% AC With Overload Relay

1% DC2% AC With Overload Relay

2% DC volts, 3% AC volts3% DC current, 4% AC current

Sensitivity 20,000 chms/volt DC5,000 ohms/volt AC

20,000 ohms/volt DC5,000 ohms/volt AC



10 megohm DC, 10 megohm(100 pfd) AC, current circuit100 millivolt drop

Dimensions 7"H X 5'W X 21/4"D 7"H X 5"W X 21/4"D 7"H X 5"W x 21/4"D 7"H X 5"W X 21/4"D 7"H X 5"W X 21/.1"D

Weight Less than 2 lbs. (Batteriesincluded)

Less than 2 lbs. (Batteriesincluded)




Ranges DC Millivolts 0-250DC Volts 0-2.5/0-10/0-50/0-250/0-500/0-1000/AC Volts 0-2.5/0-10/0-50/0-250/0-500/0-1000/VAC Output 0-2.5/0-10/0-50/0.250DC Microamps 0-50DC Milliamps 0-1/0-10/0-100/0-500DC Amps 0-10Ohms RX1(0-2K)20Rcenter/RX10(0-20K)200Qcenter/RX100(0-200K)2000f2center/RX1000(0-2Meg)20Kitcenter/RX10K(0-20Meg) 200KflcenterdB Scales (1 mw on 600 ohmline) -10 to +10/+2 to+22/+16 to +36/+30 to +50/ +36 to +56

DC Millivolts 0-250DC Volts 0-2.5/0-10/0-50/0-250/0-500/0-1000/AC Volts 0-2.5/0-10/0-50/0-250/0-500/0-1000/VAC Output 0-2.5/0-10/0-50/0-250DC Microamps 0-50DC Milliamps 0-1/-10/0-100/0-500DC Amps 0-10Ohms RX1(0-2K)20f2center/RX10(0-20K)200fIcenter/RX100(0-200K)2000Ucenter/RX1000(0-2Meg)20KfIcenter/RXIOK(0-20Meg) 200KficenterdB Scales (1 mw on 600 ohmline) -10 to +10/ +2 to+22/ +16 to +36/ +30 to+50/ +36 to +56

DC Millivolts 0-250DC Volts 0-2.5/0-10/0-50/0-250/0-500/0.1000/AC Volts 0-2.5/0-10/0-50/0-250/0-500/0-1000/VAC Output 0-2.5/0-10/0-50/0-250DC Microamps 0-50DC Milliamps 0-1/0-10/0-100/0-500DC Amps 0-10Ohms RX1(0-2K)20f/center/RX10(0-20K)200(kenter/RX100(0-200K)2000ttcenter/RX1000(0-2Meg)20Kftcenter/RX10K(0-20Meg) 200KftcenterdB Scales (1 mw on 600 ohmline) -10 to +10/ +2 to+22/ +16 to +36/+30 to +50/ +36 to +56

DC Millivolts 0-250DC Volts 0-2.5/0-10/0-50/0-250/0-500/0-1000/AC Volts 0-2.5/0-10/0-50/0-250/0-500/0-1000/VAC Output 0-2.5/0-10/0-50/0-250DC Microamps 0-50DC Milliamps 0-1/0-10/0-100/0-500DC Amps 0-10Ohms RX1(0-2K)20.Ocenter/RX10(0-20K)2009center/RX100(0.200K)2000Ocenter/RX1000(0-2Meg)20Kflcenter/RXIOK(0-20Meg) 200K(.2centerdB Scales (1 mw on 600 ohmline) -10 to +10/ +2 to+22/ +16 to +36/+30 to +50/ +36 to +56

DC Millivolts 0-100/0-300DC Volts 0-1/0-3/0-10/0-30/0-100/0-300/0-1000AC Millivolts 0-100/0-300AC Volts 0-1/0-3/0-10/0-30/0-100/0-300/0-1000DC Microamps 0-1/0-10/0-100DC Milliamps 0-1/0-10/0-30AC Microamps 0-1/0-10/0-100AC Milliamps 0.1/0-10/0-30Ohms (7 normal and 7 lowpower ranges) RX1/RX10/RX100/RX1K/ RX10K/RX100K/RX1MegdB Scales -40 to -18/ -30 to-8/ -20 to +2/ -10 to +12/0 to +22/ +10 to+32/ +20 to +42/ +30 to+52/ +40 to +62

BUSINESS REPLY MAILNo Postage Stamp Necessary if Mailed in United States

FIRST CLASS

PERMIT NO.392

NEWARK, N.J.

POSTAGE WILL BE PAID BY:

WESTON INSTRUMENTS, INC.614 Frelinghuysen Ave., Newark, N.J. 07114

WESTON INSTRUMENTS, INC.614 FRELINGHUYSEN AVENUE, NEWARK, N. J. 07114

WESTON

Schlumberger

current drain and less distortionthan is usually produced by a de-fective audio output transistor,check for an open audio bypasscapacitor in the output stage (C2in Fig. 1).

Bridge a known -good capacitorof identical or similar value acrossC2; if the audio level then returnsto normal, C2 is open.

In most Bendix radios, C2 (or itsequivalent) is a small, black plas-tic capacitor mounted on theprinted -circuit board. In a fewBendix designs, the equivalent ofC2 is one section of a two -sectionelectrolytic. (The other sectionfunctions as the AGC bypasscapacitor.)

FORD AM/FM RADIOS

Fig. 2 is a top view of the circuitboard of a popular Bendix-madeFord AM/FM stereo car radio. Thisseries of radios has been used byFord for several years under anumber of different model desig-nations.

FM Local Oscillator

One frequently encounteredtrouble symptom in this series ofFord radios is intermittent FM re-ception. In a large percentage ofsuch cases, the cause is a defect inthe FM local oscillator, the circuitof which is shown in Fig. 3.

Substitution the FM local oscil-

Fig. 3-FM local oscillator circuit employed inseveral Bendix-produced AM/FM stereo radiomodels.

R1390 Cl

02FM

LIMITER

BIASNETWORK

03TRIGGER

RS100K

TO 19 KHZAMPLIFIER

Fig. 4-Limiter section employed in Bendix-produced Ford FM receivers.

lator with a grid -dip oscillator isone quick method of verifying thatthe receiver's local oscillator is in-operative. Tune the radio to a sec-tion of the FM band in which thereare two or more active stations,then loosely couple the externalcoil of the grid -dip oscillator to theFM RF amplifier input from thelocal oscillator. If the receiver'slocal oscillator is operating, youwill hear the "beat squeals" pro-duced by hetrodyning as you tunethe grid -dip oscillator across thefrequency spectrum of the re-ceiver's local oscillator. If the re-ceiver's local oscillator is inopera-tive, the output of the grid -dip os-cillator will function as the localoscillator and FM reception will beheard as you effectively tuneacross the band with the tuningknob of the grid -dip oscillator.

If the FM local oscillator is com-pletely inoperative or is so far offfrequency that no output is pro-duced, suspect the AFC diode, D1,in Fig. 3. Replace D1 with eitheran OEM version or, if the OEMtype is not locally available, re-place it with a Delco type DS -55.(Although some semiconductorcross-reference guides list 1N34,1N60, etc., types as replacementsfor D1, I have tried several with-out success.)

C2, the ceramic trimmercapacitor in Fig. 3, is another fre-quent cause of missing or inter-mittent FM reception. To deter-mine if it is the cause, gently touchit with an insulated, non-metallictuning tool; if C2 is the cause, FMreception probably will cut in andout or return completely when it isgently probed.

Improperly soldered connec-tions on the FM RF printed circuitboard also is a frequent cause ofintermittent FM reception ornoise in this series of Ford AM/FM

stereo radios. The improper solderconnection(s) often can be isolatedby gently tapping various compo-nents and areas of the board, al-though in some cases it seems thatevery area of the board is thecause. Because removal andreinstallation of the FM RF boardis a time consuming procedure, be-fore you begin it you should verifythat the customer is willing to payfor the "extra" time, particularly ifthe radio is five or more years old.

The coils on the FM RF boardare printed foil which come upthrough holes in the board. Beforeattempting to remove the board, itis necessary to first unsolder thecoil ends. Once you have the boardfree, you can remove it and scrapeoff the varnish with a razor bladeor sharp knife, and then retin allconductors on it. Reinstallation ofthe board requires a high degree ofmanual dexterity because youmust carefully thread the coilends back through the holes in theboard and then lower the boardback down into its mount. Be surethe mounting screws are snug be-cause, if loose, they also can causeintermittent FM reception.

Limiter Section

The circuitry shown in Fig. 4 isanother source of recurrent trou-ble in this series of Ford AM/FMstereo car radios.

Transistor Q3 is a trigger stagewhich turns off the stereo decoderwhen the received signal is tooweak to produce acceptable stereo.If defective, this transistor elimi-nates stereo even when the re-ceived signal is strong.

Another common cause of "nostereo" is an open in the secondarywinding of transformer T1 in Fig.4. This defect does not eliminateall FM reception, but it does re-duce the received signal so that no

Fig.5-IC-equipped audio circuit used in FM receivers produced by Motorola for imported cars.


APPLIANCEREPAIRBOOKS

Written in easy -to -understand language byexperts in the service field with illustrationsand diagrams! Acclaimed by instructorsand professionals alike! How to diagnoseand repair refrigerators, air conditioners,washers, dryers, ranges, dishwashers, vacu-um cleaners, motors, water heaters, coffee -makers, hair dryers, food mixers, can open-ers, steam irons, floor polishers, lawn careappliances, electric knives, electric and dig-ital clocks, fans and many others. Also,fundamentals of solid state, setting up ashop, using test equipment and a lot more.Only $2.65 to $4.90 each.

SEW FOR FREEDESCR/PT/Ilf PRICE 1/37

C& N, Dept. ET5841 VV. Montrose Avenue

Chicago, Illinois 60634


SEND FOR OUR BIG

FREE

CATALOG

I I :OLESAI E

FOR DEALERS ONLY!We do not sell the consumer!

II

Save onthousands of audio,

and electronic parts,test equipment and accessories.

IEC - MULLARD

88cMINIMUM 10

POPULAR 6GH8ORDER No. X 114

SEND CHECK WITHORDER - WE PAYSHIPPING CHARGE

QUALITONE INDUSTRIES, INC.17 Columbus Avenue, Tuckahoe, N.Y. 10707Please send FREE Catalog to:

Name

Company

Address

City State/Zip



go/ SOLID STATE STEREO / firuZYCIMMIX

Fig. 6-Typical version of under -dash stereo FM car radios produced for several years by Motorola.

stereo is produced, and it alsomight aggravate fading and otherFM reception problems.

Because Ti is a special type oftransformer, it must be replacedwith an OEM version. If the OEMversion is not available locally,you might try repairing the defec-tive transformer. The most usualproblem is lack of solder on thefive wires of the secondary outputpins. The best procedure is to re-move the metal shield of T1 andresolder all associated leads.

MOTOROLA INTEGRATED CIRCUITS

Audio IC

The audio circuit in Fig. 5 isfound in a number of Motorola carradios produced for "factory in-stallation" in many makes andmodels of imported cars, particu-larly Volkswagen.

The audio driver IC (usually aMotorola MFC4050) in theseradios can cause all of the troublesymptoms traditionally as-sociated with a shorted audio out-put transistor. Consequently, be-fore replacing output transistorQ1 (a PNP Germanium, usually a2N176), first short together thebase and emitter terminals of Q1while monitoring the A -line cur-rent. If the current drops to nearzero, driver IC1 probably is defec-tive.

After replacing IC1, measurethe collector voltage of Q1 andcompare it with the valuespecified in the Motorola or Sam'sAR service manual. If the mea-sured voltage is excessive, Q1probably is leaky and should bereplaced. Also check Ll for signs ofoverheating. (Do not mistake thewax and varnish on Ll for burnmarks; the color is similar.)

FM IF ICs

Motorola has produced a

Fig. 7-IC-equipped FM IF amplifier stage em-ployed in many Motorola car radios. (In mostdesigns. four of these stages are connected incascade.)

number of stereo FM car radiomodels in both "factory installed"and "add-on" versions (includingthe under -dash design in Fig. 6).

In these radios, weak or no FMcan be caused by a defective tunermodule; however, a more frequentcause of either of these troublesymptoms is a defective IC in theFM IF amplifier section (Fig. 7).First, measure the voltage on theIC input terminals (3 and 5) andthe output terminals (1 and 7).The voltage on terminals 3 and 5should be slightly less than 2VDC, and that on terminals 1 and7 should be close to 8 VDC. If thevoltage on any of these terminalsis significantly different than thatspecified or is zero, replace the IC.

If the voltages on the IC termi-nals are normal or near normal,tune the radio to a relatively weakFM station and, while audiblymonitoring the audio output,bridge a .01-mfd capacitor acrossIC terminals 5 and 7. If the outputlevel increases, the driver ICprobably is defective.

The µA703 audio driver IC usedin many of these radios is availa-ble from most electronic partshouses. I prefer the metal case 703over the plastic case type becauseit seems to be more reliable andcosts only a little more.

Be extremely careful whentroubleshooting these ICs. Oneslip of a probe and you have a de-fective IC for sure.

CARR TALK

There are well over a hundreddifferent brands of car tapeplayers on the market. Some ofthese are produced by a relativelysmall number of "major" man-ufacturers who market themunder their own brand name orsell them to large, private -labelmarketers. Direct replacementparts usually are available fromthese "major" manufacturersand/or marketers, although insome cases you have to "order andwait."

However, there is a significantpercentage of car tape playerbrands for which direct replace-ment parts are not availableunder any conditions-regardlessof how long you and the customerare willing to wait. (It seems thatthe post office boxes of some ofthese "off brand" car tape playermarketers are canceled even be-fore the last of their units are inthe hands of the "bargain -oriented" consumers who buythem.)

The manner in which youhandle these "off brand" can havea significant impact on the profit-ability of your vehicular elec-tronics servicing business. In myopinion, there are only threerealistic approaches you can use:1) you can courteously explain tothe customer that, because re-placement parts are not available,the unit is economically unrepair-able and therefore, in the interestof the customer's pocketbook, youmust decline to attempt repairs.2) You can courteously explain tothe customer that, because directreplacement parts are not availa-ble for the unit, the "bargain as-pect" of his or her "bargain" tapeplayer automatically terminatedwhen the player ceased to operateproperly and that you will acceptthe unit for repair only if the cus-tomer is willing to pay the "extra"labor charges that will be incurredif you have to spend additionaltime repairing or fabricating a re-placement for a nonstandard part.3) You can courteously explain tothe customer that, because directreplacement parts are not availa-

With Joseph J. Carr, ET/D VehicularElectronics Editor

ble for the unit, you will accept itonly for attempted re pair and thenonly under the condition that thecustomer must pay for the diag-nosis even if it reveals that theunit is unrepairable because a"nonavailable" part is defective.

Regardless of which of the pre-ceding approaches or combinationof approaches you use, to avoid"customer relations" problems lat-er, it is wise to have available, forthe customer's signature, a"standard" form which clearly andprecisely spells out the conditionsunder which you are accepting theunit for repair or attempted re-pair. The form also should proba-bly spell out the applicable provi-sions of the mechanics lien law inyour city or state, if there is one.(Most lien laws specify the condi-tions under which unreclaimedequipment becomes the propertyof the servicing agency.)

Before you decide to take on orcontinue the repair of thosebrands of car tape players forwhich direct replacement partsare not available, you first shouldconsider the following factors:1) If you presently have a suffi-cient volume of "major brands"servicing to fill in all of your shoptime, there really is no "percent-age" in tackling "off brand" servic-ing except in the inevitable, buthopefully rare, case in which youneed to do so to keep a "good" cus-tomer happy.2) If you presently have someshop "open" time and definitelyknow that you cannot fill it in byactively soliciting more "major"brand servicing, you probably willbe financially better off if ybu takeup the slack by first acceptingsome brands for which the availa-bility of parts is questionable andthen, if necessary, by acceptingthose brands for which you knowthat direct replacement parts arenot available.

Accumulation of an assortmentof "nonrepairable" car tape play-ers from which you can can-nibalize any needed parts that arenot available from conventionalsources will increase your chances

of realizing a realistic level of prof-it from "off brand" servicing. Be-cause of the duplications andsimilarities inherent in the elec-trical and mechanical designs ofmost brands of car tape players,the use of cannibalization as analternative source of parts is prob-ably more successful for car tapeplayers than with any other typeof consumer entertainment prod-uct-but only if you have a suffi-cient variety of brands from whichto cannibalize, and then only ifyou have the time and are in-ovative and skilled enough toperform the bending; filing andother types of fabricating thatoften are required.

Playback heads and drivemotors are two examples of themany car tape player parts whichare relatively easy to replaceeither by cannibalization or by theuse of "universal" replacement.

Fortunately, because there arerelatively few really different de-signs of playback heads used in8 -track and cassette car tapeunits, a large percentage ofplayback heads can be replacedwith the universal types availablefrom most electronic parts dis-tribution. In those few situationsin which a universal type will notfit, you often can use a smallerhead by placing brass or coppershim stock in the extra space be-tween the head and the head car-riage assembly.

Despite the fact that thereseemingly is a wide variety of tapeplayer motors, a high percentageof these also can be replaced witheither universal types or by can-nibalization and minor fabrica-tion. The first characteristic toconsider is whether the originalmotor rotates clockwise or coun-terclockwise (motor mounted"pulley up" or "pulley down"). Thesecond consideration is whetherthe original has three or fourwires. (If you are familiar withwinding and centrifugal switchconnections of player motors, youmight be able to convert a four -wire motor to three -wire opera -

continued on page 49


ET/D 1975 SUBJECTREFERENCE INDEX

The first numerical group followingeach listing indicates the month of theissue in which it appeared, and thesecond numerical group indicatesthe page on which coverage of the topicappears or begins. The two -letteralphabetical code in parenthesisimmediately following some listingsindicates coverage in one of thefollowing ET/D regular departments:Dealer Showcase (DS),New Products (NP), TechnicalDigest (TD), Test Instrument Report(TR)

ANTENNAS (Including Systems & Accessories)Action Builds Antenna BusinessAntenna Amplifiers, Channel Master Model 0070B (NP)Antenna Coupler, Leader Model LAC -895 (NP)Antenna Mount, South River Model PM -105 (NP)Antenna Preamp/Amp, Jerrold Electronics Model 4287 -PC (NP)Antenna Preamplifier, ACM Model AA37 (NP)Antenna Towers, Jerrold Electronics ODMX (NP)Bringing TV Down To The ValleysCable Crimping Tool, Channel Master Model 7188C (NP)Coaxial Cable Clips, Electrovert, Inc (NP)CP Applied To TVDistribution Amplifier, ACA Model MSV70 (NP)Distribution Amplifier, Jerrold Electronics Model IDA-45 (NP)How To Use A Field -Strength MeterMAN/CAN Tapoff System, Blonder -Tongue Model 4960 Control (NP)MAN Distribution Amplifier, Delta-Benco-Cascade, Model DA -60 (NP)MAN LeasingMAN Mixing/Dividing Network Delta-Benco-Cascade Model MDN-7....(NP)MAN Passive Devices, RMS Electronics, Inc. Model 1040/S FM (NP)MAN Splitter, Winegard Co. Model AS -8 (NP)MAN Tape, ACA Model DT100 (NP)Modulators, Blonder -Tongue, Inc., Model AVMT4923 (NP)Showroom MANSingle Channel Amplifier, Jerrold Electronics Model JHPM (NP)Single Channel Signal Injectors, Delta-Benco-Cascade Inc. Model SI-75 (NP)Stacking N AntennasTripod Roof Tower, South River, Model 100KD (NP)N Antenna, JFD Electronics Corp., Model LPS-158 (NP)N Antenna Rotor System, Cornell-Dubilier Model SA22 (NP)N Antenna, S&A Electronics Target 360 (NP)UHF -To -VHF Converter, Blonder -Tongue Model UX-3 (NP)Variable N/FM Signal Attenuator, Blonder -TongueLaboratories Model VA -18 (NP)VHF Antenna Circuit Indicator, Ascom Electronic Products ModelASM 104 (NP)VHF/FM Antenna, RCA Model 3BG37 (NP)VHF Mobile Antenna, The Antenna Specialists Co., Model ASP -830 (NP)VHF Single Channel Amplifier, The Finney Co. Model G-120 (NP)VHF Single Channel Pre -Amplifier, The Finney Co. Model G-25 (NP)VHF/UHF/FM Antenna, The Finney Co. Model 1776 (NP)VHF/UHF Preamplifier, 0 -Bit Corp. Model PA -0530 (NP)

AUDIOCassette Recorder, Channel Master Model 6323 (DS)Cassette Stereo Recorder, 3M/Wollensak Model 4766 (DS)Dolby FM Compensator, Switchcraft, Inc., Model 621 (DS)

4/2010/5211/538/474/421/466/448/124/413/538/334/38

10/502/26

10/515/43

11/164/425/469/506/454/405/243/518/446/127/474/404/36

11/517/45

Failure To Change Programs Properly, Magnavox Eight -TrackTape Player Model VE16 (TD) 8/41Four -Channel Turntable, BSR Model 4310X (DS) 1/47Hum Caused by AM/FM RFI, 8 -Track Tape Player, Magnavox ModelVE16 (TD) 9/48Microphone, 3M Co (DS) 5/49Parabolic Reflector, Sony Model PBR-400 (DS) 4/52Power Amplifier Modules, General Electric (NP) 11/53Record Changer/Turntable, Technics By Panasonic Model SL -1330 3/54Remote Control Speaker Timer, Workman Electronic Products,Inc., Model N70-162 (DS) 2/46Service Hint, Admiral Stereo Chassis 2S2 (TD) 9/44Speakers, Ouam-Nichols Co. Model 52C1OFEXZ4 (DS) 4/54Tape Player Adjustments, Magnavox (TO) 6/41Tape Player, BSR McDonald Model TD8OW (DS) 4/55Tape System, Sony Model TC-570 (DS) 2/45

AUTO ELECTRONICSAuto Entertainment Electronics-A State -Of -The -Art Report-Part 1 3/23A Look At The Most Recent Circuit Developments In Car Radio and TapeProducts 3/23Auto Entertainment Electronics-A State -Of -The -Art Report-Part 2 4/28Recent Developments In Car Radio And Tape Products 4/28Auto FM Amplifier, Antennacraft (DS) 5/49Auto Stereo Cassette Player, Panasonic Model CO -840 (DS) 2/44Carr Talk-Common Signal -Seeker Radio Problems 10/38Carr Talk-How To Break Into Medical Electronics Servicing 11/46Digital Frequency Counters For Servicing-Part I 1/30FM Receiver Alignment 11/36Mobile Antenna Mount, Larsen Electronics (NP) 8/44Selecting and Installing Two -Way Mobile Antennas 10/39Selecting Equipment For Your Auto Electronics Bench 12/37Servicing Signal -Seeking Auto Radios-Part I 9/36Signal Seeking Tuners-Part II 10/36VHF Mobile Antenna, The Antenna Specialists Co., Model ASP -830 ....(NP) 1/44

BUSINESS MANAGEMENTAction Builds Antenna Business 4/20Efficient Service -Call Dispatching 3/16MAN Leasing 11/16Profit From Remote Control 8/34Profitable And Competitive Pricing Of Home Service Calls 1/22Profitably Speaking 10/22Profitably Speaking-Facts And Figures Discussion Of The ProfitabilityOf Stocking TV Modules 11/20Profitably Speaking-RCA's Color N Labor Warranty Extension 12/12Reappraising The Legal Structure Of Your Business 12/ 8Regulation Of The N Repair Industry In Louisiana And California 4/14Showroom MAN 5/24Systematic Service Labor Pricing 10/14Technician Productivity Of Incentive Pay 9/24

B -W TVGeneral Electric N 1976 11/22Home Entertainment Electronics 1976 8/30RCA TV 1976 10/24Sound Distortion, General Electric N Chassis XA (TD) 6/39

COLOR TVAdapting In -Line To Delta 8/28Audio Pop At Turn Off, Magnavox Color N Chassis T995 (TD) 6/42Brightness Change After Turn -On, Magnavox Color N Chassis T995 (TD) 8/40Broken Tertiary Leads-Improved Sweep Transformer, ZenithColor N Chassis 17/19EC45 (TD) 3/50Capacitor No. 22-7233 Problems, Zenith Color N Chassis 17EC35,17EC45, 19EC45 (TD) 11/28Chroma Board, General Electric Color N Chassis C2 and CD (TD) 9/46Coax Cable Connections, Magnavox Star Remote Control (TO) 9/48Color N Module Guide (Magnavox) 12/24Color N Module Guide (RCA) 11/26Color N Module Guide-Zenith G -Line Color Chassis 10/28Convergence Extension Cable, Admiral Color N Chassis M24/M25/M30 (TD) 6/39CRT Burn Spots, Magnavox Color N Chassis T981/2/7 (TD) 6/41CRT Interchangeability, Magnavox All Color N Chassis (TD) 3/50Failure Of Resistors R232 And R235 Magnavox Color N ChassisT981/982/987 (TD) 9/47

9/49 General Electric TV 1976 11/22High Voltage Rectifier/Tripler Short Magnavox Color TV Chassis (TD) 1/43

6/43 Hiss In Sound, Zenith Color N Chassis 17/19EC45 (TD) 4/486/43 Home Entertainment Electronics 1976 8/301/44 Horizontal Module And Regulator Module Variations, Magnavox6/46 Color N Chassis T981/2/7 (TD) 9/469/52 Horizontal Oscillator Module, Admiral M800 (A8924-1) (TD) 6/39

12/44 Horizontal Tearing And/Or Poor Sync, Admiral Color N Chassis10/53 40, K10 Series (TD) 10/30

Improved Horizontal Turn -Off Characteristics, Zenith Color NChassis 17/19EC45 (TO) 6/42

2/46 Improved Video Response, General Electric Color N Chassis CD (TD) 6/403/54 Increasing Color Gain, General Electric Color N Chassis C1/L1 (TD) 6/402/44 Inoperative Set, Magnavox Color TV Chassis T985/986 (TO) 12/41


Insufficient Vertical Sweep, Admiral Color TV Chassis K10 (TD) 12/41 Basis 11/42

Isolating Chroma Troubles In Synchronous Diode Chroma Demodulator Comm Chat-"Factory-Originated" Troubles In New Communications

Systems 2/20 Equipment 12/32

Keystoned Or Slanted Raster, Magnavox Color TV Chassis T981/2/7 ...(TD) 12/43 Comm Chat-FCC Rules And Regulations 10/44

Loss Of Flesh Tones, Magnavox Color TV Chassis T981/2/7 (TD) 2/37 Comm Chat-The CB Scene 9/32

Loss Of Vertical Or Horizontal Sync, Admiral Color TV Citizens Band Radio, Tram/Diamond Corp. TRAMXL (NP) 10/51

Chassis T15K10/16K10 (TD) 10/30 Digital Frequency Counters For Servicing-Part 1 1/30

Magnavox Color TV Model 4352 (DS) 1/47 Digital Frequency Counters For Servicing-Part 2 2/24

Minimizing Brightness Drift, Zenith Color TV Chassis 17/19EC45 (TD) 4/48 Equipment For SSB Servicing 11/44

New In Color TV For 1975-Part 5, (RCA T -Line Series) 1/26 Home Entertainment Electronics 1976 8/30

New In Color TV For 1975-Part 6 (GTE Sylvania) 2/28 Intro To SSB 8/20

New In Color TV For 1975-Part 7 (Zenith) 3/28 Monitor Crystals, United States Crystal Corp (NP) 12/46

New In Color TV For 1975-Part 8 (Quasar Electronics) 4/24 Tips For Easier Adjustment Of SSB Transceivers 12/30

New In Color TV For 1975-Part 9 (Panasonic)New LDR Holders, Magnavox TV Sets (TD)

5/281/43

MEDICAL ELECTRONICS920 KHz Beat In Picture, General Electric Color TV Chassis C2/CD (TD) 4/47 Carr Talk-How To Break Into Medical Electronics Servicing 11/46No High Voltage, Magnavox Color TV Chassis T995 (TD) 8/40 Medical Electronics-A Healthy New Field For Servicers-Part 1 5/18

No Raster, But Sound Normal, General Electric Color TV Chassis MC ..(TD) 7/44 Medical Electronics-A Healthy New Field For Servicers-Part 2 6/28Overheating Filament Transformers, Magnavox Color TV ChassisT981/2/7 (TD) 12/43 MERCHANDISINGOverheating Replacement HV Capacitor, Admiral Color TV Chassis Capacitor Assortment, Sprague No. TK-28 (NP) 4/413M20/3K19/T41K10 (TO) 9/44 In -Store Sign, Altec Corp. The Sound Of Experience (DS) 2/45Picture Bending, Zenith Color TV Chassis 17/19EC45 (TD) 3/50 Outdoor Sign, General Electric "Color TV Radio Service" (DS) 4/55Power Supply Diode Failures, Magnavox Color TV Chassis T981/2/7 ...(TD) 6/42 Phono Parts Program, EV-Game Inc. Model DPP -18 (NP) 4/40Power Supply Regulator Circuits 7/34Power Supply Transformers And Assemblies, General Electric RADIOColor TV Chassis MB -75 (TD) 12/41 Diode Reversed, Magnavox Radio Chassis R331/332 (TD) 1/43Production Changes RGB Screen Control Circuit, General Electric FM Receiver Alignment 11/36Color TV Chassis CD (TD) 10/30 High Volume Whistle, Magnavox Radio Chassis R331/2/3/4 (TD) 12/41Random Shut Off, Magnavox Star TV Remote Control (TD) 11/28 Output Failures, Magnavox Radio Chassis R243/4/5/7 (TD) 5/42Rapid On/Off Operation, Magnavox Star TV Systems (TD) 6/42 Power Supply Regulator Circuits 7/34Raster, But No Sound On Video, Admiral Color TV Chassis K19 (TD) 9/44 Schematic Correction, Magnavox Radio Chassis R286 (TD) 1/43RCA's New Color Trak TV 12/14 Weak AM Reception, Magnavox Radio Chassis R320 (TO) 3/50RCA TV 1976 10/24Replacement Focus Module, Admiral TV Chassis K18 (TD) 10/30 OFFICE EQUIPMENTReplacement Modules, Admiral Color TV (TD) 2/36 Account Collection System, Ever Ready Label Corp (NP) 1/45Replacement Parts, General Electric Color TV Chassis CB (TD) 10/31 Intercom, Fisher Berkeley, EKTACOM (DS) 5/49Replacement UHF Pot Strips, Magnavox 21 Detent Tuners (TD) 7/44 Telephone Amplifier/Monitor, Workman Electronics Products Inc.,Resistor R303 Location Change, Magnavox Color TV Chassis Tele-Secretary (DS) 2/44T981/1982 (TO) 2/37Revised Horizontal Hold Adjustment, Admiral Color TV Chassis M10 (TD) 8/39 SECURITY & SURVEILLANCE SYSTEMSRinging On Left Side Of Raster, Zenith Color TV Chassis 17/19EC45 (TD)Routine Checks For Replacement, Magnavox Star Tuning Assembly (TD)

Scan Derived Power Supplies, Admiral Color TV Chassis M10 (TD)Service Hint, Admiral Color TV Chassis G11/G13/H10/H12/K15 (TD)Service Hint, Admiral Color TV Chassis K18 (TD)Service Hint. Admiral Color TV Chassis M10 (TD)Service Hint, Admiral Color TV Chassis M24, M25, M30 (TD)

Service Hint, Admiral Color TV Chassis M24, M25, M30 (TD)

Service Hint, Admiral Color TV Chassis M24/M25/M30/1M30 (TD)

5/428/407/442/362/369/44

12/4112/41

9/46

Alarm Installer's Tool Kits, Alarm Supply Co. Model MW -751 (NP)

Motion Detector, Master Lock Co. (DS)

Packaged Security Cables, Belden UNREEL (NP)

Passive Infrared Detector, Mountain West Alarm, Model R7 (DS)Residential Fire Detector, Honeywell (DS)Smoke Alarms, Mallory Distributor Products Co., Model SDA-3. (DS)Smoke Detector, Mountain West Alarm Model E5 (NP)

Vehicle Alarm, Wolo, Model MACH 4 (DS)

12/464/544/384/543/552/459/513/54

Service Hint, Admiral Color TV Chassis M25/M24 (TD) 2/36 SEMICONDUCTORS (General)Service Hint, Admiral Color TV Chassis 4M10 (TD) 2/37Servicing Modular Color TV Chassis Admiral (TD)Servicing The IF and RF Circuits, Magnavox Color TV Chassis T995 (TD)6F Remote, 120 Hz Hum Bars, Magnavox Color TV Chassis T989 (TD)

Slight Audio Feedthrough, Magnavox Star Systems (TD)Solving Tuning Problems, GTE Sylvania Color TV Chassis E04 (TD)

8/3910/482/378/414/47

Coping With ICs"Exotic" Semiconductors-Theory & TestingFacts About Testing FETsLight -Emitting DiodesPower Rectifiers

8/247/205/133/383/37

Snow, No Picture, Magnavox Color TV Chassis T960/T984 (TD) 4/48 Rectifier, International Rectifier, R210 (NP) 5/48

Strong Color In Purity And Service Positions Of Service SwitchMagnavox Color TV Chassis T995 (TD)Thermistors, Oneida Electronic Mfg., Inc. No. GB -205 (NP)

Troubleshooting Horizontal Deflection & High Voltage Circuits-Part I .(TBD)Troubleshooting Horizontal Deflection & High Voltage Circuits-Part II (TBD)

Troubleshooting No Chroma

9/478/441/35

2/326/24

Semiconductor Diodes-A Perspective For ServicersSemiconductor Kit, General Electric No. K934 (NP)

Small -Signal DiodesTesting Bipolar Transistors In And Out Of CircuitTransistor Beta-A Perspective For Service TechniciansTuning DiodesZener Diodes

3/368/453/401/122/123/373/40

Tuner Subber Aids Troubleshooting, Magnavox Star Remote Control ...(TD) 11/28 SERVICE AIDSTV Delay Lines, J. W. Miller (NP) 8/42Vector Pattern Analysis of Chroma Circuits 9/14 Antenna Mast/Conduit Carrier, UPEC Corp. "Condu-Carrier" (NP) 10/53

Vertical Jitter, Magnavox Color TV Chassis T960 (TD) 6/42 Cable Sheath Slitter, P.K. Neuses, Inc. No. N-62267 (NP) 7/46

Vertical Jitter, Magnavox Color TV Chassis T985/986 (TD) 7/44 Circuit Board Extractor, Branem Industries, Inc (NP) 8/45

Vertical Output Failure, Magnavox Color TV Chassis T989 (TD) 6/40 Color TV Module Caddy, RCA (NP) 5/43

Zenith Color TV 1976 9/20 Components Kits, International Components Corp (NP) 9/55Contact Burnisher, P. K. Neuses, Inc., Model CB -5 (NP) 5/45

COMMERCIAL TWO-WAY Contact Cleaner, LPS Research Laboratories (NP) 8/46

Equipment For SSB ServicingPM & Annual Checkout Of VHF Marine TransceiversRadio Pager, Motorola METRO -PAGE BOY (DS)Tips For Easier Adjustment of SSB TransceiversTwo -Way FM Business Radio, Pace Two -Way Radio ProductsModel B13100 (NP)Two -Way Radio Base Stations, General Electric, MASTRII (NP)VHF Transceiver, Regency Electronics, Inc., Micro-Com U-11 (NP)

11/44

9/284/52

12/30

11/523/53

11/54

Cordless Soldering Iron, Weller Model WC100 (NP)

De -Soldering Aid, Wick -It Electronics Corp., "Wik-IT" (NP)De -Soldering Tool, Tech -Tool Industries Model S-16 (NP)Electrical/Electronic Maintenance Kit, Triplett Corp. Model 60 (NP)Electronic Tool Kit, Jensen Tools and Alloys, Model JTK-6 (NP)Flameproof Film Resistors, RCA (NP)Fuse Adapter, Workman Electronics (NP)

Fused Power -Tap, B & D Products, Inc., "Add -A -Fuse" (NP)Galvanic Iron and Steel Protection, CRC Chemicals, "CRC Zinc It" (NP)

11/534/428/479/548/429/552/427/465/48

COMMUNICATIONS CBIntegrated Circuit Tool, GC Electronics No. 9481 (NP)

Medical Service Kit, Jensen Tools and Alloys Model JTK-75 (NP)10/539/49

CB Antenna, Russell Industries "Rubber Duckie" (NP) 11/53 Nutd rivers, Xcelite (NP) 6/43CB Antennas, Antenna Specialists Co. "Range Riders" (NP) 9/53 Over -Voltage Protector, General Electric, GE-MOV (NP) 2/43

CB Base Station, E. F. Johnson Co. "Messenger 132" (DS) 4/52 Plastic Repair For Servicers 6/34CB Interference Filters, Avanti R & D (NP) 9/51 Solder, Multicore Solders, HMP Alloy (NP) 6/46

CB Two -Way Radio, E. F. Johnson Co. "Messenger 120A" (NP) 12/45 Soldering Tips, Wahl Clipper Corp (NP) 10/52

Comm Chat --Concept Of Servicing Electronics On A Contract Labor Teflon Lubricant, Wonderglide Lube Products Corp., Wonder -Glide (NP) 5/43


Test Jig Cables And Adapters, RCA (NP) 9/50 Electronic Counter, Simpson Model 7026 (NP) 2/43

Tool Case, Platt Luggage Model 610 (NP) 6/44 Ferrograph Auxiliary Test Unit ATU1 (TR) 8/36

Tool Kit, Vaco Products Co. No. 99500 (NP) 12/44 Ferrograph Test Set Model RTS2 (TR) 8/36

Tool Kits, Henry Mann Inc (NP) 9/52 FET/VTVM Electrotester, Sanwa Model EM -800 (TR) 11/49

Tuner Spray, Chemtronics Model CLD-4 (NP) 10/55 FM Deviation Monitor, Lampkin Laboratories Inc., Model 2050 (NP) 4/41

TV Tuner Lubricant/Polisher, Chemtronics, TUN -O -POWER (NP) 4/42 FM Signal Generator, Gaw Co. Model 1012 (NP) 7/45

Wire Stripping Tool, Vaco Products Co., "Stripex" (NP) 9/52 Frequency Counter, B & K Model 1801 (TR) 9/34Wiring/Crimping Tool, Vaco Products Co. No. 70285 (NP) 11/52 Frequency Counter, Heath Schlumberger Model SM-109A (NP) 10/50

Frequency Counter, John Fluke Manufacturing Co. Model 1920A (NP) 11/51

SHOP EQUIPMENT Frequency Counter, Systron-Donner Model 6220A (NP) 9/54

All Purpose/Test Table, General Electric (NP)

Cable Crimping Tool, Channel Master Model 7188C (NP)Chek-A-Color Color TV Test Jig Sylvania Model CK3000 (TR)Color TV Test Jig, GTE Sylvania Model CK200 (NP)Color TV Test Jig, RCA Model 10J106 (NP)De -Soldering Tool, Tech -Tool Industries, Tech -Wick Model S-16 (NP)Portable Soldering Iron Kit, General Electric (NP)Power Supply, Eico Electronic Instrument Co., Inc., Model 1040 (NP)Rechargeable Soldering Station, Ungar, Div. of Eldon Industries,inc. No. 194 (NP)Soldering Gun, Wall-Lenk Manufacturing Co., Model 2116 (NP)Soldering Iron Cleaner, GC Electronics RE -TIP (NP)Soldering Iron, Weller Model W-60 (NP)

Soldering Station, Hexacon Electric Co., No. 1520 (NP)Staple Gun Tacker, Arrow Fastener Co., Inc., Model T-37 (NP)Storage Wall, Hallowell Div., Standard Pressed Steel Co., Model 1100 (NP)Test Fixtures Using Rectangular Tubes (TD)

Test Fixtures Using Round Tubes (TD)

Thermal Spot Tester, Wahl Clipper (NP)Tool Case, Vaco Products Co., "Super Case" (NP)

TV Service Table, RCA (NP)Update Needed For Latest Sets, General Electric Color TVShop Test Fixture (TD)

5/464/41

12/338/46

11/518/471/466/43

6/448/424/49

10/554/515/454/493/503/502/41

4/384/50

3/50

Function Generator, Exact Electronics Inc., Model 129 (NP)Function Generator, Heath Company Model SG -1271 (NP)Function Generator, Hickok, Model 270 (NP)Function Generator, Hickok, Model 270 (TR)Function Generator, Hickok, Model 270 (NP)Handheld DMM, Data Technology Model 21 (TR)High Volt/Current Probe, Eico Electronic Instrument Co., Inc., ModelHVP-5 (NP)How To Use A Field -Strength MeterIn -Line Color TV Test Jig, GTE Sylvania Model CK3000 (NP)Maintenance/Appliance Tester, RCA (NP)Multifunction Counter, Data Precision Model 5740 (NP)Multi -Function Counter, Data Precision Model 5740 (TR)Multimeter, Data Precision Corp., Model 1455 (NP)Multimeter, Philips Test & Measuring Instruments Model PM2503 (NP)Oscilloscope, Ballantine Laboratories, Inc., Model 1010A (NP)Oscilloscope, EDL Instruments, Inc., Model 170 (NP)Oscilloscope, Heath Model 4530 (NP)Oscilloscope, Hewlett-Packard Model 1222A (NP)Oscilloscope, Hickok Model 512 (NP)Oscilloscope, Leader Instrument Corp., Model LBO -552 (NP)Oscilloscope, Lectrotech, Inc., Model TO -60 (NP)Oscilloscope, Lectrotech Model TO -60 (TR)Oscilloscope, Philips Test & Measuring, Inc., Model PM3240 (NP)

2/41

8/454/379/359/522/40

4/4212/264/364/408/44

10/469/533/527/45

11/529/555/45

10/519/534/387/401/44

TELEVISION (General) Oscilloscope, Tektronix, Inc., Model D32 (NP) 8/47Oscilloscope, Tektronix T900 Series (NP) 10/54

Capacitors-Types, Characteristics And Applications 7/12 Picture Tube Tester/Renewer, RCA Model WT -333B (TR) 10/45High Voltage TV Wire, General Electric (NP) 5/43 Probe Meter, Heath Model 5210 (NP) 9/49Plastic Repair For Servicers 6/34 Pulse/Sweep/Function Generator, Dana Exact Electronics,Power Supply Regulator Circuits 7/34 Inc., Model 516 (NP) 8/47Powers, Logs & dBs-A Brief Review 7/28 Resistance Test Unit, Phipp & Bird, Model 236-A (NP) 10/52Profit From Remote Control 8/34 RF Signal Generator, Leader Model LSG-16 (NP) 10/54Projection TV Kit, Miami Projection TV (NP) 11/52 Selecting Equipment For Your Auto Electronics Bench 12/37Rectifier, International Rectifier, R210 (NP) 5/48 Semiconductor Tester, Hickok Model 215 (NP) 3/51Thermistors, Oneida Electronic Manufacturing, No. GB -205 (NP) 8/44 Signal Level Meter, Blonder -Tongue Model FSM-3 (NP) 4/40Understanding Scope Specs-Part 1 (TBD) 3/43 Substituner, Tuner Service Corp (TR) 7/43Understanding Scope Specs-Part 2 (TBD) 5/32 Substitute Tuner, Telematic Model KTE 725 (NP) 5/43

TEST INSTRUMENTSSweep/Function Generator, Dana Exact Electronics, Inc., Model 196A (NP)Sylvania Chek-A-Color Model CK3000 Color TV Test Jig. (TR)

7/4612/33

Audio Flutter Meter, 3M Model 816 (TR) 6/37 Test Probe, Herman H. Smith, Inc., "The Hookon" (NP) 9/53

Audio Tester, Leader Instruments Model LAV-190 (NP) 4/41 Transistor Analyzer, Sencore Model TF30 (TR) 4/44

Audio Tester, Leader Model LAV-190 (TR) 9/35 Transistor/Diode Tester, Eico Model 688 (NP) 8/46

Battery Tester, RCA Model WT -537A (NP) 8/42 Transistor/Diode Tester, Wayne Model WT2A (TR) 3/47

Cathode Recovery Unit/CRT Tester, REM Electronics Model CRU-1B . ..(NP) 8/43 Transistor Tester, B & K Model 520 (NP) 9/50

Cathode Recovery Unit/CRT Tester, REM Model CRU-1B (TR) 11/48 Triggered Sweep Oscilloscope, B & K Model 1472 (NP) 8/44

CB Service Monitor, Lampkin Model 109 (NP) 7/47 Tube tester, Hickok Model 230 (NP) 8/43

CB Service Monitor, Zodiac Model U-2 (NP) 9/50 Tuner Substitution Unit, PTS Electronics Inc., Model 4001 (NP) 11/52

Coaxial Wattmeter, Bird Electronic Corp., Model 4527 (NP) 10/54 TV Test Jig, RCA Model 10J106 (NP) 4/36

Color Bar Pattern Generator, American Technology Corp.. Model Understanding Scope Specs-Part 1 3/43

ATC-10 (NP) 10/50 Understanding Scope Specs-Part 2 5/32

Color Generator, Lectrotech Model BG-10 (TR) 5/40 Universal Counter, Systron-Donner, Model 6250A (NP) 6/46

Color Pattern-Generator, Simpson Electric Co., Model 432 (NP) 8/46 VOM, International Components Corp., Model IC -210 (NP) 9/49

Color TV Test Jig, RCA Model 10J106 (NP) 11/51 VOM, Simpson Electric Co., Model 260-6XL (NP) 4/37

Color TV Test Jig Regulator, GTE Sylvania Model CK200 (NP) 8/46 VOM, Simpson Electric Co., Model 303-3XL (NP) 11/51

CRT Analyzer/Rejuvenator, Hickok Model 265 (NP) 4/50 VOM, Triplett Corp., Model 60 (NP) 4/38

CRT Restorer/Analyzer, B & K Model 467 (NP) 9/54 VOM, Triplett Corp., Model 60 (TR) 7/40

CRT Tester And Restorer, Sencore, Inc., Model CR31 (NP) 4/51 VOM, Triplett Model 60 (NP) 8/45

Curve Tracer, Hickok Model 440 (NP) 4/37 VOM, Weston Model 660 (TR) 8/37

Curve Tracer, Hickok Model 440 (TR) 8/37 Yoke And Flyback Tester, Sencore Model YF33 (NP) 9/52

Digit DVM, Sencore Model DVM32 (NP)Digita Frequency Counter For Servicing-Part 1

4/371/30 ARTICLE INDEX

Digita Frequency Counter For Servicing-Part 2 2/24 Action Builds Antenna Business 4/20Digita Logic Counter Probe, Zi-Tech Model DP -6000 (NP) 9/55 Adapting In -Line To Delta 8/28Digita Multimeter, B & K Model 280 (NP) 4/36 Auto Entertainment Electronics-A State -Of -The -Art Report-Part 1 3/23Digita Multimeter, B & K Model 280 (TR) 8/36 Auto Entertainment Electronics-A State -Of -The -Art Report-Part 2 4/28

Digita /Multimeter, Data Precision Corp., Model 245 (TR) 4/44 Bringing TV Down To The Valleys 8/12

Dig ita Multimeter, Data Precision Corp., Model 1450 (NP) 2/41 Capacitors-Types, Characteristics And Applications 7/12

Digita Multimeter, Heath Model IM -2202 (NP) 7/45 Carr Talk-Common Problems In Signal -Seeker Car Radios 10/38

Digita Multimeter, Hewlett-Packard Model HP970A (TR) 6/36 Carr Talk-How To Break Into Medical Electronics Servicing 11/46Digita Multimeter, Peck/Boss, Inc., Model 390 (NP) 1/45 Carr Talk-Pointers For Proficient Test Taking 12/40

Digita Multimeter, Philips Model PM2522 (NP) 6/45 Color TV Module Guide (Magnavox) 12/24

Digit Multimeter, Simpson Electric Co., Model 464 (NP) 10/52 Color TV Module Guide (RCA) 11/26

Digita Multimeter, Systron Donner Model 7004A (TR) 7/42 Color TV Module Guide (Zenith) 10/28

Digit Multimeter, Tekelec Model TA357 (TR) 1/42 Comm Chat-"Factory-Originated" Troubles In New CommunicationsDigita VOM, Simpson Electric Co., Model 360 (NP) 6/43 Equipment 12/32

Dip Meter, Heathkit Model HD -1250 (TR) 9/34 Comm Chat-Recent FCC Rule Changes Which Affect CB 9/32Distortion Meter, Leader Instruments Corp., Model LDM-170 (NP) 4/41 Comm Chat-The Concept Of Serving Electronics On A Contract Labor Basis 11/42

Distortion Meter, Leader Model LDM-170 (TR) 10/46 Comm Chat-Type Acceptance And FCC Regs And Practices 10/44DMM, Data Technology Model 20 (TR) 5/40 Coping With ICS 8/24Dual -Trace Oscilloscope, B & K Model 1472 (TR) 10/45 CP Applied To TV 8/33Dual -Trace Scope, Telequipment Model 061 (TR) 2/38 continued on page 49


NEW PRODUCTSDescriptions and specifications of the products in-cluded in this department are provided by the man-ufacturers. For additional information, circle the cor-responding numbers on the Reader Service Card inthis issue.

EIGHT -TRACK DECK TESTER 134

Aspen Ltd., introduced a new DeckTester, a simplified approach forevaluating all 8 -track cartridgeplayers. The Deck Tester No. 12A isencased in an 8 -track cartridge withwhich anyone can check to determinethat his 8 -track deck is operatingproperly or if it is in need of repair. Nometers or other electronic equipmentare needed to test home and autoplayers. An instruction booklet is in-

a/penA TEST TAPE

FOR ALL 8 -TRACY

CARTRIDGE

PLAYERS.

FOR H E ARE

'LE

cluded with the two-color package. Atape speed test can be timed over a sixminute period or the correct speed canbe ascertained immediately by com-paring Middle A on a musical instru-ment with the test tone. Also includedis a tonal right and left speaker testand a tonal speaker rattle test. Thespeakers are electrically thrown inand out of phase so the individual caneasily hear the difference. The testsindicate whether the speakers areoperating properly and are placedproperly. Wow and flutter, headalignment, worn head and cross talkproblems can be readily determined.An automatic channel switching testassures the listener that the deck ischanging to the correct tracks. Price is$6.98.

ELECTRICAL TOOL 135

Hunter Tools announces a multi-purpose, five -in -one Model 55A Elec-trical Tool. This tool features serratedplier jaws for gripping, pulling, orbending. Its stripper capabilities willhandle gauges 10 through 22 AWG

/Isolid wires, and 12 through 24stranded wires. As a steel sharpenedwire cutter, it becomes a screw cutterfor six of the most common screw sizes,4-40, 5-40, 6-32, 8-32, 10-24. The toolwill crimp insulated terminals, insu-lated terminals 12-10, insulated ter-minals 22-14, 7mm auto, and RG59coax. A new and uniquely designedstop prevents the wire stripping holesfrom closing beyond the wire diameterand cutting the wires. The handle isrolled and dipped to provide a com-fortable, L/4 inch cushioned vinyl grip.

DIGITAL MULTIMETER 136

A new 41/2 digit, five -function digitalmultimeter from Hewlett-Packardcombines low cost with accuracy forboth bench and field use. Called theModel 3465A, the multimeter coversa DC measurement range from li.tv to1 kv with a mid -range accuracy of ±(0.02 percent of rdg. + 0.01 percent ofrge.). AC measurement range is 10µvto 500 volts with a mid -range accuracyof + (0.15 percent of rdg. +0.05 per-cent of rge) over a 40 Hz to 20 KHzbandwidth. AC and DC current mea-surement range is from 10 nanoampsto two amps. DC current accuracy forthe 10 mA range is + (0.1 percent ofrdg. + 0.01 percent of rge.) AC currentmeasurements are made over a fre-

quency band of 40 Hz to 20 KHz with amid -band accuracy of ± (0.25 percentof rdg. + 0.25 percent rge.). Resistancerange is 10 milliohms to 20 Megohmswith a mid -range accuracy of ± (0.02percent of rdg + 0.01 percent of rge).Open circuit voltage on the ohms ter-minal when set to its lowest rangedoes not exceed 5 volts, preventingdamage to most solid-state devices.Input protection is provided to 1 kv onand DC range, 500 Vrms on any ACrange, and 350 V peak on any resis-tance range. A front panel fuse pro-tects the instrument from overloadwhen measuring current. Input ter-minals are recessed to meet safety re-quirements. The input terminal forcurrent also contains the fuse and iseasily extracted from the front panel.International symbols as well as volt-age limitations are shown on the frontpanel. The price of the Model 3465A,Option 002, D -cell batteries, is $425,Option 001, AC only is $480, and withrechargeable nickel -cadmium bat-teries is $500.

MOBILE CB NOISE FILTER 137

Cornell Dubilier has developed a 60amp and 100 amp. Alternator/Generator Noise (electromagnetic)Filter. These units, designed for easyinstallation, block out unwanted

DELUXE DIGITAL COLOR

CONVERGENCE GENERATOR10 ROCK SOLID PATTERNS

ALL IC COUNTDOWN CIRCUITS

QUARTZ CRYSTAL OSCILLATORS

2 FULL YEARS' WARRANTY

MITA:CnNvE.E,JEEI( E GENERATOR

llin M1111,1111.1

EtECO MODELSc

MODEL SG -150 $7595

Elena, Electroni(S

ONLY

$5995

MODEL

SG -100

2 Patterns: 20 x 16 Crosshatch, 320Dots, weight only 17 oz.

WRITE OR CALL FOR DETAILS

ELENCO ELECTRONICS INC.1928 Raymond Dr., Northbrook, IL 60062

1312) 564-0919

..for more details circle 115 on Reader Service Card


Il11!-

"conducted" noise created by alterna-tor/generator systems in automobiles,trucks, tractors, and marine vehicles.The filters are designed with capaci-tive and inductive elements, provid-ing a broad range of noise suppressionproduced at different speeds. They donot require tuning, further simplify-ing their use and applications. TheCB60 and CB100 are designed for longtrouble -free service and can withstandshock, vibration, corrosion and ex-treme temperatures. They are instal-led by simply removing one bolt fromthe alternator/generator and instal-ling the filter's termination. Flexiblecabling allows easy application in var-iety of vehicle configurations.

UNIVERSAL COUNTER/TIMER 138

A high-performance 80 MHz uni-versal counter/timer is introduced byJohn Fluke Mfg. Co., Ltd. The Model

1952B, is a 7 -digit, 6 -functioncounter/timer featuring direct coupledinputs, dual trigger status indicators,variable trigger level controls, and anoscilloscope marker output. Countingfrom DC to 80 MHz, the instrumentmeasures frequency, frequency ratio,single period, multiple period aver-ages, time interval, totalize and gate -able totals. The LED display incorpo-rates automatic units annunciation,overflow indication, and leading zerosuppression. The two input channelsare direct coupled, eliminating anypossibility of waveform distortion,while the use of dual trigger status

indicators simplifies triggering leveladjustment. Control of coupling, slopeand trigger level is provided includingboth pre-set and variable trigger levelcontrols that let you start and stopyour triggering points anywhere on

the waveform. In addition, a 5 -voltmarker output signal, when connectedto an oscilloscope Z axis, intensitymodulates the portion of the waveformdisplayed during the time intervalbeing measured. Price is $750.

SOLDER REMOVER BRAID 139

Hexacon Electric Co., announces anew size and packaging for Hex-Wik,its solder remover braid. It is nowavailable in a 5/32 inch width as wellas in 1/16 inch and 1/8 inch wide sizes.The specially tinned wire promotes

solderability and wicking action andextends shelf life. The fine, 40 AWGwire (only .0031 inch diameter) pro-vides more surface area, almost 18square inches per foot of braid, andconsequently greater capillary actionand capacity to absorb solder. The sol-

Thar Money Generator

A BETTERAPPROAC

TO TV

OWe

.14p,

ss,, ifts410

HANALYZING Pat. Pend.

The ATC-10 is different from other color bar pattern generators. It's like aportable test lab with the versatility to perform the most commonly usedfunctions of an analyst and a substitute tuner. It's a time saver for bothin -home and on -the -bench servicing. That's why we've nicknamed it theMONEY GENERATOR. Since it takes more than a few words to describe theATC-10's many unique features, we'd like to send you our big 4 pageillustrated brochure.This brochure tells you about the ATC-10's unique patterns which includeRED RASTER, 3.58 MONITOR, GRAY QUAD, and HATCHDOTS. It alsodescribes some unusual test capabilities such as: A full range of crystalcontrolled RF, IF, and video injection signals Receiver sensitivity anddynamic range checks using the calibrated RF output control Fast accu-rate purity and 3.58 oscillator checks with no need to disable guns or shorttest point(s) Extra clear oscilloscope and vector patterns In -Home re-ceiver bandpass checks at 60 Hz, 1.78 MHz, and 3.56 MHz Completeconvergence series using a single composite pattern (all of these and manymore for only $299.95.)

rail Request To:The brochure is free, but, ifyou'd like still more informs-' AMERICAN TECHNOLOGY CORP.

Lion on the operation of the 225 Main, Dept. 1B, Canon City, CO 81212ATC-10, you can obtain a copy'

Nameof the 2 volume (home -shop)owner's manual. Just include I

Address$1.00 for postage and handling.Act now and evaluate for your- I ...cityself the many ways the ATC-l0can be a real MONEY GENER- I

State ZipkTOR for you.

Three years ago we tooka chance and she turned out to be

one of our best investments.When Maggie applied for the job,

we had reservations about hiring her.That was three years ago and she haslong since proved herself one of themost energetic and successful em-ployees we have.

The President's Committee on Employment of the Handicapped


44 / ELEC I RONIC TECHNICIAN/DEALER. JANUARY 1976

NATION-WIDETUBE & TRANSISTOR CO.

Our 23rd MAIL ORDER YEARORDER NOW from This Sample Listing

OZ41451631K31LN51R51S51T41U41V22AF43A33AF43AU63BU83BZ63CB63DG43DT63G K53S43V44CB64EJ75B075CL85J65T85U45U85V45V65X86AF46AF116AG56AG76AH46AK56AL56AM86AR116AS86AT8

ORIGINATORSOF

45 Tubes

$39 per 100Some Slightly Higher

6AU46AV56AV66AW86AX46AY36BA66BC56BF66BG66BH66BK46BL76BL86BN668266BZ76CB66CE36CD66CG86CJ36CL66CL8

6CM76CY56DE46DE66DG66DQ56DQ66DW46EB86EJ76EM76ES56EW66E256F56FH56FQ76FS56GC56GE56G F76GJ76G K56G K6

6GU76H66HA.56HB76J56J66JC56J H66JS66JT86K66K116KY86KZ86LB66LU86M 086M N860116546S86SA76SK76SL7

65076T86X46X56X87A47AU7 24A7H7 258068810 25CD68F67 25L68LT8 25W49A8 25Z610DE7 27106K6 31L2610658 33GY7124E10 34CE312AT7 35LR612AU7 39/4412AV5 42EC412AV6 500512AX4 50L612AX7 7712BA6 786812BE6

12BH712BY712CU512DQ612F812HL712J512L612SA712SK712SL712SN712SQ713FD714J715KY816AQ317AY317BF1117DQ617JN618G B5190921LU822JU62329

FREE BONUS: An AM/FM Pocket Radio willbe sent free with every order of $39 or morefrom the above listing. (May Be Purchasedfor $9.95 prepaid.)FREE BONUS: RCA Tube Caddy with everyorder of $117 or more from the above tubelist. Caddy may be purchased for $21.95plus $2 UPS.

SPECIAL SALE(From This Ad Only)

254 Per Tube $22 Per 100Boxed -branded -code dated -shipped prepaid

6496 6BQ6 61307 6SN7 6U8

1 Year GuaranteeWith Every 100 Tubes Or More From Above5 Types, We will Send You A FREE HANDYPOCKET TUBE TESTER. IMay Be PurchasedOutright for $4.95 Prepaid.)All tubes individually boxed and codedated, guaranteed 1 year. 5 -day moneyback offer. All tubes shipped immediately,prepaid. List several alternates, if possible.

SEND FOR FREE COMPLETE LISTISOLID-STATE REPAIR

Our Home Entertainment Repair Dept.will repair any unit from a pocket radioto a transistor TV. Sample charges:cassette $8.95 plus parts, AM car ra-dio $8.95 plus parts. Please send allbroken parts. List problems with unit.Mutilated units $2.50 extra. Send nomoney with repairs. When completed,they will be returned COD. Satisfactionguaranteed or your money back.Send for Free List of Our 20mm Black andWhite Picture Tubes.TERMS: All orders shipped prepaid! No mini-mum order. Send check or money order. Add$1.00 for handling on orders under $10. Ca-nadian & Foreign, add approx. postage 25%deposit on COD's.

NATION-WIDETUBE & TRANSISTOR CO.

1275 Stuyvesant Ave., Union, N.J. 07083Tel. 1201) 688-1414 Dept. ET1


der remover braid is available in stan-dard lengths of 6, 10, 25, 50 and 100feet. Lengths of 25 feet and longer arepackaged in the new Dispenser Pakwhich provides added protection andpermits easy withdrawal of the braidunder production conditions.

AUDIO ACCESSORY PRODUCTS 140

A new profitable line of audio acces-sory products are introduced by TechSpray, Inc. The product line is mar-keted under the name of Kleer Tone.The product line consists of 13 prod-ucts, formulated to maintain audio

equipment and help improve audiofidelity. Introduced are three newproducts for the audio market. Thefirst is Speaker Cone Renew (StockNo. 2213) designed to rejuvenate stiff,dry speaker cones, second, a Wood OilTreatment (Stock No. 2206) formu-lated to prevent oiled wood cabinetsfrom splitting and cracking and third,a Record Shampoo (Stock No. 2207)made to be mixed with water to re-move dirt, dust and oily fingerprints.The balance of the line is comprised ofTape Head Cleaner, packaged in bothaerosol and bottle, Tape Head Lube,Cleaning Sticks and Cloths, RecordCleaner, Speaker Cement and ContactAerosol Spray Cleaner.

TV ANTENNA TOWER 141

Western Communications Service isbuilding and assembling a 400 -foottower for use in television antennasystems. Assembled in 21 -foot sec-tions, the tower is manufactured fromcylindrical high grade steel, andbraced with one -inch nominal diame-ter steel pipe. The guyed tower utilizesVs inch, seven -strand galvanized steelwire. Each section, containing bandsof international orange and white, ishot -dipped zinc galvanized and con-tains a coat of rust inhibiting red

346 WaysTo Save OnInstruments!EICO's Test Instruments lineis the industry's mostcomprehensive because eachinstrument serves a specificgroup of professional needs.You name the requirement-from a resistance box to aVTVM, from a signal tracer toa scope, from a tube tester toa color TV generator, etc., youcan depend on EICO to giveyou the best professionalvalue. Compare our latestsolid state instruments at yourlocal EICO ElectronicsDistributor, he knows yourneeds best-and serves yourrequirements with the bestvalues!

"Build -it -Yourself" and saveup to 50% with our famouselectronic kits.

For latest EICO Catalog on TestInstruments, Automotive and HobbyElectronics, Eicocraft Project kits,Burglar -Fire Alarm Systems and nameof nearest EICO Distributor, check readerservice card or send 500 for fast firstclass mail service.

EICO-283 Malta Street,Brooklyn, N.Y. 1120730 years of service to the ProfessionalServiceman.

EICO 0



primer paint. All towers are designedfor 125 -mile winds with no ice, and95 -mile winds with 1/2 -inch radial iceload. The towers are open face and oftriangular configuration. Each of the21 -foot sections weighs approximately500 pounds. The towers are plumbedwithin 1 -inch plus or minus of plumbper 100 feet in height, and a ladder forclimbing is provided on one face of thetower.

SWEEP/MARKER GENERATOR 142

The Model LSW-333, an all -channelsweep/marker generator for checkingand aligning all tuned circuits inTV/VHF/UHF and FM receivers is in-troduced by Leader Instruments Corp.The circuitry of the generator allowsit, in combination with an oscillo-scope, to align tuners, video sound, IFamplifiers and traps in less timeone normally would take. The sweepsection covers TV channels 2 to 13 and14 to 83 while video sweep modulationis available for VIF and chroma circuitchecking. FM and IF sweeps are alsoincluded. The marker section of thegenerator is also said to feature anhigh level of accuracy through the useof crystal controlled signals and per-mits the use of 100 KHz and 1 KHzside markers on all signals. Trap ad-justments and IF alignments are

simplified because of the use of tenVIF markers with horizontal and ver-tical tilt. There is also a 1 KHz AMmodulation signal. Polarity reversalswitches for inverting both the verti-cal and horizontal traces, as well asthree bias supplies are also present.Other features include: a vertical gainwith X 5 magnification to compensatefor scope sensitivity; an output meterwith calibrated attenuator and 15.75MHz filter to suppress TV horizontalreceiver sweep; sweep output voltageof over 100mV/rms into 75 ohms. Priceis $649.95.

ANTENNA PREAMP/AMPLIFIER 143

A new combination UHF/VHF/FMpreamplifier is announced by JerroldElectronics. Called the Powercaster

The "New Generation"Flat -Rate Pricing...is proving itself in thousands of shops fromcoast to coast-it prices your work profitablywhile creating customer good -will.

Fast tab indexing to 19 major repaircategories prices all bench, home and over-the-counter repairs with authority.

tv 6 -radio

tech's guideto pricing

Plus, ComputerizedPocket -Size PartsCatalog.Customized toyour desiredparts profit.Lists over 3500most -used parts,continually up -dated.Can easily recoverinitial investment inless than 30 days...$75.00 plus $10.00per catalog.

A

Satellite Edition...the same system describedabove, only reduced toshirt -pocket size foroutside service...$16.95 ea. post pd.Quantity prices available.

Lincoln, NE 68505P.O. Box 5234 =man mg 00 urn

sperry tech inc.

11=1

Professional6 x 9 hard cover,steel ring -boundedition....$18.95 ea. post pd.

U

U

U

copies, Hardbound copies, Satellitecopies, Parts Catalog. El More informationAmount enclosed, check or money order.(NE res. add sales tax)

NAMECO.ADDRESSCITYSTATE ZIP

4M1===IMINIMIIIIMIII=MMIMIIIM=M111===1111===M11...tor more details circle 131 on Reader Service Card


Model 4287 -PC, the unit combines aJerrold mast mounted Powermatetype preamplifier with a Jerrold Col-orcaster type indoor amplifier. The re-sult is high gain and high outputcapability. The unit is expected to beespecially popular in fringe areas, foruse with multiple set installations inhomes, apartment houses, hotels andmotels. VHF gain is 30 dB, UHF gainis 25 dB and the FM gain is 18 dB. Out-put capability is + 40 dBmV for each offour VHF channels and 37.5 dBmV foreach of the three UHF channels. Inputof the mast or boom mounted preamp

is matched to 300 ohm antennas.Downlead and output impedance are75 ohms. A built-in 12 dB FM tunabletrap can be used to eliminate interfer-ence from a local FM station. For re-ception in deep fringe areas, noise fig-ure of the unit is very low, 6 dB at VHFand 8 dB at UHF. Price is $97.50.

APPLIANCE NOISE FILTER 144

Cornell-Dubilier announced a newand efficient filter for interferenceproduced by hot combs, blenders, elec-tric shavers, etc. Simply plug theModel CBBS-1 Noise Filter into the

wall socket and then plug the -noisy"appliance into the unit. Most annoy-ing noise which hampers radios andTV's are removed. The unit is light-weight, reliable and is built to resistthe effects of heavy usage.

MULTIMETER 145

A new multimeter is introduced byJames G. Biddle Co. The Model AVO8/Mark 5 Multimeter allows you toread AC or DC current to 10 amperes,and AC or DC voltages up to 3000 volts.You can also measure resistancesto 20 megohms (200 megohms with

external power supply), plus make dec-ibel readings on the AC volt scale.Easy -to -read, clear, linear scales withanti-parallex mirrors, plus uniqueoverload protection are employed inall AVO 8 instruments. All of the in-struments receive .a 7 kv flash test be-fore they leave the factory. Price is$215.

COMPONENT TESTER 146

The new Component Tester ModelCT -10 introduced by Instant Instru-ments Inc., verifies any type diode rec-tifier, silicon, germanium or seleniumas well as most solid state junctionelectronic devices in use today. De-vices such as PNP and NPN transistorjunctions, FET's LED's rectifier as-semblies and most other PN junctionsemiconductors, are affectively ver-ified. The tester determines 1) Junc-tion shorted 2) Junction open 3) Junc-tion conducting 4) Direction of currentflow (polarity). An additional testfunction allows polarized and non -polarized capacitor verification for po-larity, leakage, open and short circuit.Test leads are also provided, when the

tester is used for in -circuit troubleshooting, or as a continuity checker.Price is $19.

SIDEBAND CB RADIO 147

The E.F. Johnson Co., introduced anew SSB/AM mobile radio, the "Vik-ing 352". Featured on the radio areeasy to use individual controls for allfunctions, eliminating tandem -typedual function controls. Also featuredis a mode selector employing colorkeyed amber, red, and blue lights togive indication of AM, USB, and LSB

0

modes at a glance. For protection frominterference, the receiver utilizes acrystal lattice filter to achieve selec-tivity of -60 dB at + 15 KHz. Both afull time automatic noise limiter cir-cuit and a separate RF-type noiseblanker are provided. The transmitteris rated at the maximum legal poweron both AM and sideband and featuresautomatic speech compression for con-sistent, high level modulation. Theradio also features a built-in PA func-tion, illuminated metering, and dualpolarity operation from positive ornegative ground 12 volt DC.

COMMUNICATIONSOSCILLOSCOPE 148

IF circuit wave form observationsalong with SSB and AM transmittersignal monitoring has been made pos-sible by Leader Instruments Corp.through the introduction of its newLBO -310 Ham Oscilloscope. The new3 -inch scope, which has a vertical sen-sitivity of 20 mVp-p/div and a verticalbandwidth of DC to 4 MHz will also

rT & T VALUE SALORAYTHEON, I.C.C., RCA, SYLVANIA, ETC.

FAMOUS MAKE. NEW JOBBER -BOXED TUBESNOW WITH NEW 5 -YEAR GUARANTEE

80% Off LIST

1 V2 5 for 3.00 0 6HA5 for $4.80

33AAT3255 forfor

45..9550 ID °JCS for $5.65

2AV2 5 for 3.95 0 SHQ5 for $6.35ID 6HV5 for 11.80

30K5 5 $4.85 0 SJES for 11.15SHHAm55 551foorr 5$44..5800

H 1135,1116forfor

$3'530U 5GH8 5 for $5.90

SAYS 5 for $5.05D 6K AS $8.15

(313K4 6 for $9.35 6KT8 for 6.85130G3 5 for 4.95

6K E8 for 7.65

6KZ8 for 5.156008 5 for 5.40 0 13LB6 for 10.756CJ3 5 for 4.70 0 6L06 for 11.158DW4 5 for 4.70 0 8F07 for $3.75SEAS 5 for $4.95 IC 12BY7 for $4.506EH7 5 for $4.80 0 120N7 for $7.006EJ7 5 for 4.50 0 17JZ8 for 4.506FQ7 5 for 3.75 0 29Z9 for 6.00

0 60J7 5 for 3.40 D 38HE7 for $9.20

EIGF7 5 for8GH8 5 for 3.95

33OY7 for 8.0536MC8 for 11.40

0 130M6 5 for 5.25 0 38HK7 5 for 9.00O 613U7 5 for $5.25 0 42K816 5 for 9.15

What Is not advertised -write In at 80%Off List!

O A 8GH8 SPECIAL 100 for $69.00SYLVANIA TUBES - NEW FACTORY BOXED70% & 10% Off LIST ON ENTIRE LINE

O 3A3 5 for $8.82 0 6HA5 5 for $6.480 613K4 5 for $8.35 CI EILB6 5 for 14.51El 130.13 5 for $6.35 0 fil-Q13 5 for 15.050 8FQ7 5 for $5.08 0 17JZ8 5 for $8.080 60118 5 for $5.83 0 23Z9 5 for $8.10

TRANSISTORS EQUAL TO: Up To 90% off LISTSK ECG

3018 121 5 for $2.253040 154 5 for $3.753041 152 5 for $4.20

308233005524 184

226

131

6 for 3.90

5 for5 for 4.50

3083 183 5 for $5.253084 196 5 for 6.003103 1573124 112533A

5 for 2.405 for 3.00

3114

31325 for 2.10

107 7035 for 2.602 for 1.00

IC8 704 ea. 1.00IC20 920 ea. 1.00Hep 707

0 115 for $12.50

Zen. 221-42 0ZeeP 74n.2521-45 5 for $5.00Zen. 221-48 0 Zen. 221-48 5 for $5.00Zen. 221-65 5 for $5.00ECG -712 0 ECG -718 5 for $6.00ECG -722 0 ECG -723 5 for $5.00ECG -725 0 ECG -728 5 for $5.00ECG -740 0 ECG -743 5 for $5.00

LA30R4G1E DISCOUNTS$39.00 per 100''

70N ALL TEST EQUIPMENTO B & K Precision Portable Digital Multi -

meter Model 280. Reg. Price $99.95 -Our Price

RCA Damper Diode Equiv. To:

S85.00DIODES & RECTIFIERS EQUIV.

O RCA 120818 $1.50 0 RCA 136932 $2.85n 6500 PIV Color Focus Rect. 10 for $6.00O 2.5 amp. 100 PIV-IR 170 100 for $8.95O Zen. Voltage Trlpler 212-136 2 for $8.00O Syl. Voltage Triple, 32.29778-3 ea. $9.95

YOKESD If --1134 e/ ya..$163.2

9.9595 4 for $26.00

Yea. $9

AilDY10-1-37 1ARTRIDGES - NEEDLES - SPEAKERS-$.95REPL .ID N44 D N75 0 N77O N3 -7D Needle

ea. $2.950 N91 0 V15O Asst. Cart.

10 for 12.508 for 10.00

O Zen. Cart. 142-187 3 for 10.00O Tetrad SN4 Cart. 5 for 10.00O GE 650 Cart. 3 for 10.00

O EV 5080 Cart.10 for

5 for7.50D GE Show & Tell LC2

El Tetrad Cart., Asst. 5 for $ 0.00ANTENNAS

O 72 ohm Signal Splitters 5 for $8.50D 72 ohm to 300 ohm MatchingD 59U "F" Connectors

10 for $7.50Transformers100 for $10.00

O 300 ohm 2 -set Coupler C012 5 for $7.50GENERAL

O 19 & 25', 0 210,Color Boosters

D 117V to 6-12-18V AC3 for $11.95

4 for 58.00O 4 Asst. New Tuners Incl. Tubes $16.00O 4 Asst. New Color Tuners Incl.

4 Asst. Combo TunersO 20 Asst. Belts (Dealer Net $70)

$25.00Zen. TubesLl

O UHF Tuners

$2$07..0000

Your Cost6 for $5.00

D FREE -$100. List of Merchandise -our Choice

O FREE DESK LAMP WITH ANY ORDERLETTERS OF CREDIT & ALL CHECKSPLACED ON DEPOSIT WITH MANUFAC-TURERS HANOVER TRUST BANK, N. Y. C.MASTER CHARGE ACCEPTED

Minimum Orders $50-F.O.B. Brooklyn, N.Y.Catalogs $1 -Refundable upon your orderC.O.D.'s 50% deposit -CASH ONLY

T & T SALES CO.4802 AVINUE K

BROOKLYN, N. Y. 11234Phone: (212) 241-5940



Hoo boy, have we got a dealfor you! Ordinarily you'd

expect to pay at least $965 fora good sweeper alone. Butwhat good's a sweeper withouta scope? So we're offering youboth at this incredibly low price.

First there's our Model 1050A,a compact, laboratory -qualitysweeper covering the frequen-cy range of 1 to 400 MHz. Itfeatures excellent linearity,PIN diode leveling and has abuilt-in detector. Naturally,the 1050A is all solid state and

has provisions for up to 6 plug-in marker modules.

The other half of this combois our Model 1901B X -Y Dis-play Oscilloscope. It has a big12 -inch diagonal CRT and in-corporates a very stable, low -noise vertical amplifier withsensitivities from lmV perdivision. Just hook it up toyour 1050A sweeper and youhave the perfect test setupfor measuring frequency re-sponse in the VHF region.

And that's not all. We're

also throwing in all the cablesyou'll need to connect theselittle winners. The completeset-up can be ordered asFRS -400.

If you can pass up a deallike this, you're crazier thanwe are. WAVETEK IndianaIncorporated, P.O. Box 190,66 North First Avenue,Beech Grove, Indiana 46107,Phone (317) 783-3221,TWX 810-341-3226.

WAva-reK

indicate the tuned condition for RTTYoperation as well as facilitate SSBsignal observation through the use ofan internal, two-tone generator. Theoscilloscope in combination with theLA -31 adapter will also provide con-tinuous monitoring of RF output to500 W. Maximum input to the verticalamplifier is 600 v, DC + AC peak -to -peak at a 1M impedance. Transmittermonitoring is possible from 1.8 to 54MHz at power levels from 2 to 500 Wwith a deflection sensitivity of 1 W perdivision into 50 ohm or 75 ohm impe-dances. The oscilloscope is priced at$269.95. The LA -31 Adapter is $22.95.

DIGITAL MULTIMETER 149

The Siliconix DVM Chip Set is com-bined with a 3'/2 -digit LED display toprovide simplified construction in thisnew multimeter announced by AlphaCentauri Electronics, Inc. Basic DCaccuracy is .05 percent of reading ±digit with a full scale range of 1999. In

addition to DC voltage ranges from200 my to 2000 volts the meter hasACV, DC ma, K Ohms and a separateMegohm range that goes to 2000Megohms full scale. The multimeter isavailable with either the Litronix1/2 -inch LED's as Model 75A priced at

$159.59 or with .3 -inch LED's asModel 75B for $149.95.

Please do not send money for items forwhich there is a fee. The Reader ServiceCard indicates your interest in an item.The company or organization will bill youdirectly.

CARR TALKcontinued from page 39tion.) Compare the color coding ofthe wires of the original and theprospective replacement, if theyare the same, your chances areimproved. Also compare the DCresistances of the two motors; ifthey are within ± 25 percent, thechances of a compatable replace-ment are further improved. Fi-nally, connect up the replacementand see if it works.

If the speed of the replacementmotor is too fast or too slow, re-place the original flywheel withone that has a larger or smallerdiameter. (A stock of used anduniversal flywheels is essential.)

An alternative cannibalizationprocedure is to measure thediameter of the original flywheeland then find a "nonrepairable"tape player with the same size offlywheel and a known -good motorand regulator circuit. Remove allthree from the nonrepairable unitand "fit" them into the unit youare attempting to repair.M

COMM CHATcontinued from page 28waveguides take the place oftransistors, power amplifiertubes, and coaxial cables.

The upper portion of the UHFband is used for long-range radar,as well as for much of the point-to-point repeater communicationsused by civilian and militarygroups. Microwave signals can bedirected in a very tight beam byantennas which, although physi-cally small, may be hundreds ofelectrical wavelengths across. Avery weak signal can be transmit-ted either to or from a satelite.Much of the data transmitted inthe UHF band is pulse rather thanvoice and is therefore highly im-mune to interference, bothnatural and man made.

We have only scratched the sur-face of the total RF spectrum andhave not even mentioned the fre-quencies below 300 KHz or above3000 MHz. Relatively few techni-cians are concerned with opera-tions on these frequencies, andfrankly I don't know a thing aboutthem myself. However, if enoughof you are interested, either my-self or a specialist in low- or high -frequency radio will put togetheran introductory piece. (By theway, that's all you have to do tofind out about almost any subjectwithin the scope of thismagazine-tell us what youwant.)

1975 SUBJECT REFERENCE INDEX Profit From Remote ControlProfitable And Competitive Pricing Of Home Service Calls

8/341/22

continued froin page 42 Profitably Speaking 10/22Profitably Speaking-A "Facts And Figures" look At The Profitability Of

Digital Frequency Counters For Servicing-Part 1 1/30 Color TV Modules 11/20Digital Frequency Counters For Servicing-Part 2 2/24 Profitably Speaking-RCA Color TV Labor Warranty Extension 12/12Efficient Service -Call Dispatching 3/16 Reappraising The Legal Structure Of Your Business 12/ 8Equipment For SSB Servicing 11/44 RCA's New ColorTrak TV 12/14ET/D 1974 Subject Reference Index 1/38 RCA TV 1976 10/24"Exotic" Semiconductors-Theory & Testing 7/20 Regulation Of The TV Repair Industry In Louisiana And California 4/14Facts About Testing FETs 5/13 Selecting And Installing Two -Way Mobile Antennas 10/39FM Receiver Alignment 11/36 Selecting Equipment For Your Auto Electronics Bench 12/37General Electric TV 1976 11/22 Semiconductor Diodes-A Perspective For Servicers 3/36Home Entertainment Electronics 1976 8/30 Servicing Signal -Seeking Auto Radios-Part 1 9/36How To Use A Field -Strength Meter 12/26 Servicing Signal -Seeking Auto Radios-Part 2 10/36Intro To SSB 8/20 Showroom MAN 5/24Isolating Chroma Troubles In Synchronous Diode Chroma Demodulator Stacking TV Antennas 6/13Systems 2/20 Systematic Service Labor Pricing 10/14MATV Leasing 11/16 Tech Book Digest-Troubleshooting Horizontal Deflection & High -VoltageMedical Electronics-A Healthy New Field For Servicers 5/18 Circuits-Part 1 1/35Medical Electronics-A Healthy New Field For Servicers 6/28 Tech Book Digest-Troubleshooting Horizontal Deflection & High -VoltageNew At Newcom 4/36 Circuits-Part 2 2/32New In Color TV For 1975-Part 5 (RCA) 1/26 Tech Book Digest-Understanding Scope Specs-Part 1 3/43New In Color TV For 1975-Part 6 (GTE Sylvania) 2/28 Tech Book Digest-Understanding Scope Specs-Part 2 5/32New In Color TV For 1975-Part 7 (Zenith) 3/28 Technicians Productivity & Incentive Pay 9/24New In Color TV For 1975-Part 8 (Quasar Electronics) 4/24 Testing Bipolar Transistors In And Out Of Circuit 1/12New In Color TV For 1975-Part 9 (Panasonic) 5/28 Tips For Easier Adjustment Of SSB Transceivers 12/30Plastic Repair For Servicers 6/34 Transistor Beta-A Perspective For Service Technicians 2/12PM & Annual Checkout Of VHF Marine Transceivers 9/28 Troubleshooting No Chroma -6/24Power Supply Regulator Circuits 7/34 Vector Pattern Analysis Of Chroma Circuits 9/14Powers, Logs & dBs-A Brief Review 7/28 Zenith Color TV 1976 9/20


CLASSIFIEDRATES: 40¢ per word: 500 per word Bold FaceType. Add $3.00 if you wish Box Number. Minimum$10.00 charge. Classified Display Rate billed$43.00 per inch, 1 inch minimum. Remittance mustaccompany order. Mail ad copy to: Roz Markhouse,ET/D, 757 3rd Ave., N.Y. 10017.

Business Opportunities

OWN YOUR OWN PICTURETUBE REBUILDING BUSINESS

With Lakeside InduStries re-building equipment you canrebuild any picture tube.

F., Complete details sendname address rip code toLAKESIDE INDUSTRIES3520 W Fullerton Aye.Chicago, III 60647Phone' 312-342-3399

Profitable TV service business and homefor sale. One half mile apart in EasternNassua Co. Well established and respected.Contact P. Re indorf, 6 Milford Place, Farm-ingdale, NY 11735. 2/76

CALIFORNIA BOUND? Established,modern TV/Hi-Fi repair shop, near Stan-ford, available on easy terms. Nets over$20,000 annually. Box 157, Palo Alto, Ca.94301. (415) 327-5320. 12/76

ELECTRONICS/AVIONICS EMPLOY-MENT OPPORTUNITIES. Report on jobsnow open. Details FREE. AviationEmployment Information Service, Box 240Y, Northport, New York 11768.

TV TECHNICIANS: Broadcast engineersfix equipment quickly. So will you if youqualify for my "Tough Dog" TV repair (and"hard to get" parts) WATS telephone assis-tance program. Send resume and creditreferences to Melvin Cohen, TelevisionBroadcast Engineer, May Company Build-ing, 3651 Prospect Avenue, Riviera Beach,Fla. 33404. Enclose 130 addressedenvelope. 2/76

EXPERIENCED TV TECHNICIAN. Workfor yourself. Sylvania TV Sales -Servicebusiness for sale. 40' x 48' building withbachelor quarters, lot equipment, inven-tory, for $30,000. Grossing $50,000. Verylittle competition. Mild climate. Also ad-joining 41/2 acres, large 3 bedroom home,garage will be available in spring. Gene'sTV, Route 3, Box 269, Elma, Washington98541 206-482-3011.

BUSINESS FOR SALE. T.V. Sales &Service. Zenith Franchise. For more infor-mation contact Harold Schumacker, Box265, Whittemore, Iowa 50590. 12/75

TV Service established for 18 years. Roomfor sales. Moving from area. Hal TolmasTV, 9514 Reseda Blvd., Northridge, Calif.91324. Suburb of Los Angeles. 1/76

EXPERT TV Technician needed to repairand update master antenna systems withnew patented method. No previous experi-ence as I will train you the "right way" thefirst time. No competition, as you will beone of a select number directly under mytechnical assistance tied together with aWATS telephone. Earning potential? Over$200.00 per day. Send complete resumeand credit references: Melvin Cohen, Tele-vision Broadcast Engineer, May CompanyBuilding, 3651 Prospect Avenue, RivieraBeach, Fla. 33404. Be patient for my reply.Enclose 130 addressed envelope. 2/76

Construction Plans

SURPRISE! SURPRISE! Digital PianoTuning Device tunes ALL musical instru-ments Accurately! Perfectly! Inexpen-sively! Construction -Instruction Plans Complete $12.95 Airmailed Postpaid!Moonlighting quickly repays $40 elec-tronics investment! GREEN BANK SCI-ENTIFIC, Box 100Y, Green Bank, WVa24944. 2/76

Manuals and Periodicals

REPAIR TV TUNERS -High earnings,Complete Course Details, 12 Repair Tricks,Many Plans, Two Lessons, all for $2. Re-fundable. Frank Bocek, Box 3236, Ent.,Redding, CA 96001. TF

r-send a message...

...write here.

1. Number of insertions: (circle) 1 2 3 6 122. Start with (month) issue (Copy must be in by 1st of month preceding)3. Amount enclosed: $PAYMENT MUST ACCOMPANY ORDER WE'LL BILL RATED FIRMS NO AGENCY COMMISSION

NAME COMPANY

STREET

CITY STATE ZIPMAIL COPY FOR AD(S) TO ROZ MARKHOUSE, Electronic Technician/Dealer, 757 Third Ave , New York, N Y 10017

-1

RATES: 400 per word; 50¢ per word Bold Face Type. Add $3.00 if you wish Box Number.Minimum $10.00 charge. Classified Display Rate billed $43.00 per inch, 1 inchminimum.

ELECTRONICCLASSIFIEDTECHNICIAN/DEALER


MANUAL -Numerous circuits -Analog/digital-$3.95-Electronics/ETD, P.O.Box 127, Hopedale, MA 01747. 1,76

NEW CANADIAN MAGAZINE. "ELEC-TRONICS WORKSHOP". $5.00 YEARLY.SAMPLE $1.00. ETCO-C, Box 741MONTREAL H3C2V2.

Catalogs

HEAR POLICE/FIRE Dispatchers! Cata-log shows exclusive official directories of"Confidential" channels, Send self-addressed stamped envelope. Dealerswanted. Communications, Box 56 -ET,Commack, NY 11725

Wanted

WANTED: New or used "Solid StateSweep Drive Kit" for B and K Model 1077Television Analyst. Ray Rojo, 2780 SageSt., New Orleans, LA. 70122. sum

For Sale

DIALING UNITMODEL 672

This Dialing Unit is for use with a simple tape recorder toautomatically make telephone calls for emergency or otheruse. $29.95. Free literature.

SIGHT &SOUNDSYSTEMS5619 St. John Avenue (DEPT. 5) Kansas City, Mo. 64123

ELECTRONIC TEST EQUIPMENTFOR SALE. Reconditioned or repairable,from Aerospace Industry and DOD. $0.50for catalog. James Walter Test Equip-ment, 2697 Nickel Street, San Pablo, CA94806. 8/76

"COMPLETE USED PICTURE TUBEREBUILDING EQUIPMENT" WITH 4POSITION OVEN HORIZONTALLATHE, VERTICAL SEALING MA-CHINE. CALL AFTER 3 OR WRITEFOR DETAILS -364-8666-109HANSEL ST., NEW IBERIA, LA.70560. 1/76

PRESSURE sensitive miniature cable forburglar alarm systems. Place under carpetin any contour for intrusion detection orsecret switching. $4.95 for twenty feet.Cable Switch Corp. Box .72 -ET. West LongBeach, N.J. 07764. TF

DYNACO-A-R-TRANSISTORS, REPAIRBOARDS & UNITS, SPEAKER SERVICE.SEND FOR PRICES AND DETAILS:BEAR ELECTRONICS -177 -E -HILL -CREST ROAD, MT. VERNON, N.Y.10552.

TV Owners: Automatic, diagnostic, dial -a -fix, guaranteed to save you on your TVrepairs, ($3.00) refundable. Tayo Paul, 980Greene Ave., Brooklyn, NY 11221.

BUILD THAT ELECTRONIC ORGANYOU ALWAYS WANTED AT A PRICEYOU CAN AFFORD. Third edition of "Or-gan Builder's Guide" pictured product kitline, circuits, block diagrams, designrationale using IC divider and independentgenerators with diode keying. $3.00 post-paid. Also, free brochure on keyboards.DEVTRONIX ORGAN PRODUCTS, Dept.A., 5872 Amapola Dr., San Jose, CA. 95129

CANADIANS SAVE BIG MONEY!SURPLUS, CLEAROUTS AND BANK-RUPTCY INVENTORIES. HIFI ANDPARTS. CATALOGS $1.00. ETCO-D,ELECTRONICS. Box 741, MONTREALH3C 2V2.

TV & RADIO TUBES .36¢ EA!! Send forfree color parts catalog Your order free ifnot shipped in 24 hours. Cornell Elec-tronics 4215-17 University San DiegoCalifornia 92105

HARD/TO-GET repair supplies for PoliceRadar. Request free list on letterhead.ELECTRONIC SPECIALISTS, INC., BOX122 -ET, NATICK, MASSACHUSETTS01760. 1/76

COLOR TELEPHONES with plug andjack, all new American made $29.90. Ring-ers Extra. Latest styles available, ten col-ors. Retired Installers Secrets $2. TelectraSales, Box 25117 -ET, Richmond VA23260. 12 75

Convert any transistorized T.V. tuner to atuner substituter. Plans $2.00. New accel-erated Radio & T.V. course, RADIOTELEVISION TRAINING, Box 279, ET -115, Syracuse, N.Y. 13206.

JAPANESE TRANSISTORS-All Trans-istors Original Factory Made. FreeCatalog. West Pacific Electronics, Box25837, W. Los Angeles, CA 90025. 1/76

DDM? Have it calibrated. 2'/2 and 31/2 digitDDMs. Postcard for details. Xenophonics,P.O. Box 3126, Annapolis, MD 21403. 1/76

TELEVISIONPICTURE TUBES

S TO P...Don't junk that television set. ASE manufac-tures the world's most complete line of tele-vision picture tubes. No other company offers:

Over 1700 types of television picture tubes.Most types immediate delivery.Transportation in the Midwest-paid; 1/2

transportation paid in other states.Tubes for Old or New Models.Complete line of both black & white and

color.Full 2 -year factory warranty.Lowest prices anywhere.Finest quality.

Write today for more information.

Allied Sales & Engineering, Inc.Dept. 21, Pimento, Ind. 47866

Telephone 812-495-6555

A Public Service ofThis Magazine 8The Advertising Council

How wouldyou liketo sign

the workyou do?

Maybe it's a shame that mostof us will never get to sign ourwork. Because as good as we are,it might make us better. And wecan afford to be. No matter whatkind of work we do, we'd have

more to showfor it.

qatcker Moremoney,

for onething.

Because we'dbe giving each

other ourmoney's worth for

the products, the services andeven the government we pay for.

For another thing, we'll begiving America better ammuni-tion to slug it out with our foreigncompetitors. That should helpbring the lopsided balance of pay-ments back onto our side. Andhelp make your dollars worthmore.

Best of all, as we hit our stridewe'll be protecting our jobs hereat home. And we'll get more sat-isfaction out of the jobs we've got.

You don't have to sign yourwork to see all these things hap-pen. And more.

Just do the kind of work you'dbe proud to have carry your name.

America. It only worksas well as we do.

The National Commission on/oductivity, Washington, D.C.

This ad is the work of (hoe f-rutkin and Gavino Sanna.


We carryB&K, EICO,RCA, FLUKE,SEN CORESIMPSONHICKOK andLEADER.We sell themat *% off.

*Our prices are so low the manu-facturers forbid us to advertisethem. Write and find out howmuch you can save

Complete line of tubes,tools and electronic supplies

FORDAHAPARADIO SUPPLY CO., INC.

Ilki.518 Morris Ave., Bronx, N.Y. 10451Tel: (212) 585-0330


AMAZING OFFERRADIO/TV SERVICE DATA

Your best, complete sourcefor all needed Radio and TVdiagrams and really helpfulservicing data. Most amazingvalues. Sold in sets at up to50% discount. Cover all im-portant makes and models.Use this entire ad as yourno -risk order form.- NO -RISK ORDER COUPON ------

TELEVISION SERVICE MANUALSSupreme TV manuals are still best for

faster, easier TV repairs. Accurate factorydata at bargain prices. Complete circuits,all needed alignment facts, printed circuitviews, waveforms, voltages, and double -pageschematics. Issued in large annual manuals.Sold in sets at up to 45% off, or at $4 pervolume. Send entire ad as your order form. 1965 through 1970, in 8 large volumes,

B -W & color, value $35, only $24.95O 1957 through 1964, in 7 handy volumes,

regular price $24, now only $12.95O 3 early of 1950's TV manuals, $5.95

RADIO DIAGRAM MANUALSThese low-priced radio manuals simplify

all repairs. Cover everything you may needfrom recent radios to oldtimers ; all typeradios, stereos, transistor portables, FM -AM, and auto sets. Large schematics, allneeded alignment facts, printed boards, volt-age data, dial stringing. Volumes are big,13,/2 x 11", most have 192 pages.D 1960 through 1969, in 8 volumes, cover

all makes, value $32, only $17.950 1951 through 1959, in 7 large volumes,

data you need, value $28, only $14.95D 1950, 0 1948, 0 1946, 0 1942, 0 1941,

each $4, or the set of 5 vols., $15.9581926-1938 Antique Radio data, only $7Auto Radio Repair Manual, $2.50

SUPREME PUBLICATIONS1760 Balsam Road, Highland Park, IL 60035

Rush my sets of TV and Radio manualschecked in no -risk order form of this ad. Iam enclosing full price plus $2 for postageand handling. Satisfaction guaranteed.Name:Address :

City : Zip :


READER SERVICE INDEX

ADVERTISER'S INDEX

107 American Technology Corp. ..44

108 B & K Division,Dynascan Corp. 23

109 Breaker Corp 1

110 Channel Master 29

111 Charous & Niebergall, Inc. 38

Cleveland Institute ofElectronics 53,54

112 Color Tube Centers 52

113 EICO ElectronicInstruments 45

114 Electronic Book Club 16-19

115 Elenco Electronics, Inc 43

116 Enterprise DevelopmentCorp. 52

117 Fordham Radio Supply Co.,Inc 52

GTE Sylvania-Consumer Renewal 7

118 Hewlett-Packard 27

103 Leader InstrumentsCorp. Cover 3

132 Motorola SemiconductorProducts 13

119 Nationwide 45

102 PTS Electronics Cover 2

120 Perma-Power Co. 12

121 Phipps & Bird, Inc. 25

122 Qualitone Industries, Inc. 38

131 Sperry Tech 46

Supreme Publications 52

123 T & T Sales Co 47

124 Thordarson Meissner, Inc. ....2

125 Triad/Utrad

104 Triplett Corporation

10

Cover 4

126 Tuner Service Corp 11

127 United TeletronicParts Corp. 8

133 Wavetek 48

128 Weston Instruments 35, 36

129 Winegard Company 31

130 Workman ElectronicProducts 21

INCREASE

YOURPROFITSOWN and OPERATE

A COLOR TUBECENTER

Our Complete ProgramIs Designed to

Build Your Profits1. Complete Plant and Training

... you rebuild all types ofCRTS.

2. Ongoing Engineering andManagement Assistance.

3. Sales and MarketingPrograms.

4. Financing Plans Available.

For more information write or phone:

Color Tube CentersP.O. Box 14, South Holland, Illinois 60473

(312) 877-9380 Cable CUSALECT

..for more details circle 112 on Reader Service Card

Pencil style Safety light Two heats - 20w and40w 6 tips Unbreakable handle 2 and 3 wireneoprene cords.

DESOLDERINGIRONS

Pencil style Safety light. Some operate at 40w. idleat 20w 8 7.t, yzes 2 and 3 wire neoprene cords

SOLDERING &DESOLDERING

KITS

Everything neededto solder or de -

solder or both. Allin a handy lifetime metal

box with hasp.

See your distributor or write...

Enterprise Development Corp.5127 E. 65th St Indianapolis IN 46220

PHONE (317) 251-1231


LEADER TEST INSTRUMENTS

WE MAKE IT EASYFOR you TO SERVICE

AUDIOEQUIPMENT

re. toiiike Iss 11'

LDM-170AUDIO CIRCUITDISTORTIONMETER

Measures distortion to0.01%; S/N ratio to70dB signal levels from100µV to 300V! Has ahigh gain amplifiereffective to 200KHz,plus balanced circuitrythat suppressesfundam't'l freq's from20Hz to 20KHz. TheLDM-170 is also usefulas a pre -amp in lowlevel circuits. It hasoutput terminals forscope connect. toobserve waveforms & iscompact.

An Excellent buy ...$549.95

for as low as $139.95

LAV-190WIDE BANDAUDIO ANALYZER

It's a 3 in 1 AudioGenerator, Attenuator& AC Millivoltmeter!Has 6 or 600f2, dualimpedance matchingnetwork and a 10Hz to1MHz freq'y range (5steps) in the audiogenerator section.Adjustable output is2.5Vrms into 600t3.Harmonic distortion is0.3%. The attenuator iscontinuously variableand there's a 150/2V to500V AC mVmeterscale that's easy toread! Consumes 7VA!With Accessories ...$499.95

LAG -26LOW DISTORTIONSINE/SQUAREWAVE GENERATOR

An advanced design fortesting audio &supersonic freq'yranges! Features a lowdistortion sine wave & afast rising 0.5µsec.square wave fortransient responsetests. It is also used formodulation & distortiontests. Sync's signalsfrom an externalsource; has a 200KHzfreq'y range, 4 bands;and 600 f/ outputimpedance.

A Real Value ...$139.95

LAG -120SINE/SQUAREWAVEAUDIOGENERATOR

Here's the unit thattests the most sensitiveHi-Fi gear quickly &accurately! It generatessine & square wavesfrom 10Hz to 1MHz andoffers easy push-buttonfreq'y range switching.The Solid Statecircuitry keepsdistortion to 0.1%. Alsofeatured is a built-intrigger term; switchcontrolled freq. ranges;and up to 20dBattenuation. Unusuallyaccurate & effective!Portable ...$219.95

"Put Us To The Test"

LEADERInstruments Corp.

151 DUPONT STREET, PLAINVIEW. N.Y. 11803 (516) 822-9300In Canada Ornneronor Ltd Montreal Quebec

...tor more details circle 103 on Reader Service Card

LAG -125LOW DISTORTIONAUDIOGENERATOR

The professional'sinstrument for testingHi -A, amps, speakers,filter networks, etc.Gives clean, sharpsquare waves to triggerpulse gen's & testtransient resp. Offersburst type signals forspeakers. Has dBNdual scale outputmeter; push-buttonfreq'y range select plussync. from an ext'lsource. The 10Hz-1KHzrange has a flat outputresponse and distortionis 0.C3%.

With Accessories ...$499 95

The reader that canstayon, and on, andon.The 603.The price of the Model 603V -O -M is only $173.

The one V -O -M you can forget aboutforgetting to turn off. The incredibleModel 603 FET V -O -M withexclusive Triplett Micro-PowerTMdraws only 10 uA, can stay onindefinitely without impairing per-formance. Ideal wherever frequenttest changes, interruptions, distrac-tions-or gremlins-keep your V -O -Mworking when you're not.

Truly outstanding features:1. Exclusive Triplett Micro -

Power (TMPTM) providesbattery life in excess of a yearfor carbon batteries with unitleft on continuously 24 -hoursa day.

2. Low -Power Ohms (LP0Tm)-6ranges with 70 mV powersource for in -circuit measure-ments without damage tocomponents.

3. FET V -O -M with PatentedAuto-Polarity-convenientand time -saving, always readsup scale.

Accurately measures electric andelectronic circuits on productionlines, in quality testing, during main-tenance, in service shops and oncalls, in the laboratory or classroom,in the field.

One range selector switch operatesthe unit. One probe handles allfunctions-AC, DC, MA, Ohms-anda simplified scale utilizes only 4 arcsfor all 44 ranges. The Low PowerOhm circuit permits fast circuitmeasurements without biasing semi-conductor device junctions. The

1000

300

100

30

10-LY

3

Model 603 also has a unique,Patented Auto -Polarity circuit: pusha button, measure either plus or minusvoltages without switching leads.Make very fast voltage checks wherepolarity is known or doesn't matter.

See for yourself. Try the 603. Haveyour Triplett distributor or salesrepresentative give you a free

xl MEG

x10 K

x1K

x100

r --x10

xl

-A 100

AC DC MA--"'"=millirdemonstration of the tester that canstay on indefinitely without impairingits testing performance. You'll beglad you did. Triplett Corporation,Bluffton, Ohio 45817.

TRIPLETTALL YOU'LL EVER NEED IN V -O -M's.

Triplett. The easy readers....tor more details circle 104 on Reader Service Card

JANUARY 1976 75 CENTS A HARCOURT BRACE JOVANOVICH ... · diator (vertica clement). Heavy-duty U...

Documents

Transcript of JANUARY 1976 75 CENTS A HARCOURT BRACE JOVANOVICH ... · diator (vertica clement). Heavy-duty U...