GR Exp 1926_10
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'fGENL _RADIO
.XPERIMNT
N 4 B 9
T Status of "A Btter y
Elimination B BE Eii
The quetio ot requenlyhead a the New Yo RadioShow, jus past was How abou Aeimiatos?" baey eliina-ors were ehibied in gea numesand may vaietes, bu o "subsiues of geeal apcatonapeaed
The pobem of lame suplyom alenaig cuen is eeay eren fo tha of plaesupy. It is ot a quesion of hepwe suplied u the voltage atwhh is uled The power reuired for a upy agesfrom 1 wat fo h dy cell ubeso 9 wats fo he 0 whie heplae powe fo hese ubes .wat ad 9 wats, respecvely Theaveae se daws a lamen load ofabou was ad a ae load opehas wats There s noteough derece eween thewatage requiemens of pae andamet o ivolve geat diculy
The essental deence betwee
the pate and lamen upples is hey voage whch s aou 100o he ae as comaed to 5 forthe ae As power was sequa to he cure suplied esthe supy voage, oughly twetytimes he curet s equed to suply a give nume of wats o lame as would e reured at helate. The grea dieece henbetween he demands of lamenad lae suples s no of owebu of curen. Plae cuesuy device ae no called on odelver moe a 5 0 milaeres,whie e flamen ay daw tw o or
moe apees
Drc cren power iers foalteratig n tha powe at highvolage and low cuen canno etrasered no ower at owoltage ad hgh cuet whou heuse o ahe exesive equpenI s heefore necesry o use heD. C power at the cuet andvolage uplied y the ecer
Recication and leing s generaly ecessary i oder to use aeaig ure for lamen supplyhe lat age of audo aplcaocan be un wih aeang crreno the ae wth exelle els Whe he sght hu esul-ing fom . o the lamen amie hough successive ubes,i reaches a obectonable magni-tude Ths the use o aw A. C isconed o the as tue. This sgeeraly a owe ube, and e-quies a geae ame suplyha the othes Under cerain condiions where oe hum is otojecabe, i may e possble to
oeate two sages of ado aplcaion on alrnating cuen. Thedeeo ube ust have a suy owel leed dec urrent.
The maxmum cuent avaaeom a snge tube of he kindsoualy used pla supplydeces is aout millameesThis s the curet equed by a onetue se employg a UX-99 tube. s delvered at g volage fte st s so wired tha he es arein sees any nuber (up o 0)U199 ues ay e opaedom suh a tue whe ledwth a suabe tansforme an
l s he sae un s eerally
ud or boh and B spply, woud be necessay to desgn asomes ad choes to deve hiscu a abo o n odero ae care o he ae and gridvoage o the UX-1 tue This isomewhat epenive u by omeas imposible. heosa ouciet resisace ad cue cayig caacty is also eued
It wl be seen tha A eaofor UX99 ues s easile ofa a he wie ow howeverthere is no comeca eiminaorfo this seice availabe he eldfo uch a evice would be verymie rs ecause of he com-aaiely few s ts usig 6 ilues ad seco because rewirgo the s s equired
he gof idivdual itaaos of
this
id howeve includg buidnguit ad rewiring he et sholdrove a source of odeabe roo those deaes a evice aonswho undeake i. he me ye o
insallation would no be enielybeyo'd the bouds of aclywit 0A tubes i a rece ubewee availale ulyig 5 liamees The chokes ad esitacesfor hs arrangemen would presenconsideable diculy his wouldesult in greate bulk, and maerallygreater expense tha would heequiment fo 99 tues
There ae a nume of low volage reces avalabe which ause to chge attees he out-put of these its s al o suplhe lamen cue dan an seand ey would e sable fo
geel lme uy
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�
Z
e ba n cse 1sferig. T ondr i t a evo ting - cr dg oe o and fn t dt anoh. Th lg rnt qd b e upp wd d o t
h c paiy n '
qud n paupl o pt a serous rblm Thlw vltae av hg- fyig ee a dop h y t.h s hoke hav very d I do ppr dane, and at h s odha o r e o wold eui Fraely a h -a o o dtd a · givn dg ofong e omwaEe alg for t th t co o a a w suplyto fnih 2 amp oud om ha o pt. Th d ot w mltipid gaproio ul elyi o w d.
T ost o a oa baty isf ore, y hn hat a t wod b. hbg t tike hagb mbt wc whlot b ubt d rov i m ou fm
tng r line T chr gr s oab t re adikey t ema o ome m hot atoy gl po l Th se f U-19b s l, owve ovi e expr do t rv .
Ao tp f A li wic dy ri re a lr g " . • d >trdy
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q l p·
.
Wt ube hal U in My owr
Ampler?A hr to tbs vilable fo use in the la udio stg w
c drb pwe si red wth ft aliy, om qustin
ren as o which of th tubes should ud in a given ce.
Th plae haac of te b (UX1 7 I nd X-2 I 0) or
(37 an CX1) as ws:ux
a Un<istore
Grid "
o
_ Pla e Vol:
up IJ A (Mlwat)
16!274
908
500 10 200 33020 3
u1l
O
( U(j A lfl Gi' V P Vl H (
4
910.1873
90
135
15 7.5
5025
900 8
800 5 7400 90 7.5600 0 70 76000 140 77
odg r h otpt
t l a isw r h 7 f a on-dio f p oag lowoupu rstn iras theg a re om the be t per, d m· o h l anao f hi T w est
a in gat rgtransfr at ow feqees, wheldak nec
T tg wh m pd a b wout siggd too i a idaedby b t Anco t tl will show th t a g put do
2
1 4 h t wi muh 8 volts
"'maxiu n- s n 1 Y wice
t 8 t wl ;) A 4 S v ( •· l;vr smw o h s
Th mpliction fc f 2 a vlg.
F h bv pobe w r wo ub
W e va aai l a 200 e I 71 �o vrbly
i dd to b ga os o ightb he ae l lag asy m te I 0 b od s wth 4 o its p.
Te 7 be d t o
e wn dsd obta te v a ling ow diro g e 0 I u r ce. dtd utt mr a h f 0 I A. p ak i y wd or wo t a low ea oe Wn the pt i c
pw dl�·r fm
m l q 23 o r·ct1f s b u_ ot
rqd y U L A - ' q o xv t posiy " H h
C l H pt t ud 7
NOTE x l
r r S < 11 p i l} e
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�eEXPRIMNT
he Vacuum T ub Brid ge y HORAT W L M ON, D
he degree o pe1onnd bete sdig as we
s freedom fom oe mnortoubles may b obtanedby dng he eveal patsnto a poperly desgnedbdge nt. Suh a bdges descbed e fy ne Genera ado lletn44
e uses of he reeeectode vacum tube hae be
come so manfold hat estdy of ts vrious cha ter-istcs is of cosdeable impotnce Sevel tueesngdeves more o ess eaboae n desgn
hve been
deveoped and placed n themaket. These ly consst o a sees o m s ndreotas wh o who enosed teries nd e desgned to chec ·lmenpower nd to mee cer-in socled "stat charactess suh as he jont
emssion to gd and pate ote stedy pae curent pass-g nde y patca condons of lament crrent ovoage plte votage and
F l. Th YJ> 361- acum u,t Uridge Mnf
he aachd cves egve to istate aa obtained w his bidge ponwo deen tubes. In es se mred A thegd bas was ried ove aconsdeable nge. In e
second set mred B elment voltage ws dsted at vaous e . n
DC grid bas. Fom chaactersic
es obtined hs manner thestatic ampaton onsnt andohe daa of aue a be deermined. Under ceran condions,oweve he dynamc chrterists' of a e ae f e fundaent mponce. Cief amongthese e he Aplon onsant,he Plte Resstane, and te MuuCondctance, wh the rtio of
the fome to the te.The acu vaue of he Ampica
tion Constan gee wth the vaaon o this qunty wth deentamen mpetures plae vogesnd grd potenls s of amountimportance in detemnng he opeatng hactess o a pacurbe en e as a voltage ampier. he ae Res tnce s reo less deermned by he geomeri-c constuion and te lamenemisson o the ube so tht any defect o abnormal vraton in tesefors may ready b deeted by
m a•uring hs picur dynmconsant Knowe f he aonutnce o a te s mportantin deemnng ts bevor as apoe amper and as n oscator
To obain such ta s neessayto ppy an aud feeny tonesoure preerably nusodal n chracer, to the grd te be and omae use o ceran bancedbdgemeasurements hree ccits fmeasuing hese tbe consnts aeown on page 203 of Vn der iset book "T hemonc uumube ede e g baees
y Gn Rd C
and ament rrent conols eseccuits reuie two decade resstanceboxes hree xe esstances o 1 00 nd I 0 respectvey atone source and a pa o eleponesFor auate measemens i been fond beneca to add a smalvariocouple o noduce an indcve pn between he esoce nd e pones n order ocounteract e eect of apay be
tween he be eemensTe crcus ay be se p ihndvdul peces of appaus b a
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eiher c e e plte enIp e amplaon con-
sn Mu te pte ressnce Rpan the mutal condtane gmwere measued dety on hebdge
Referng to ge A we see tthe emsson s pctcly c tsxteen vols negave on he gde no sgn of saturaon s eachedt sixteen vos positve. e amplcaon consant emans esenay
he me om to about 9 volnegative, and hen lls o s epate rent beomes anomo Wth n ncr gy posvegrd the vae of M s awayrpdy
Wth a stong negatve bs hepate resstane o ou e gh,but hs f rapdly and bomes e-sentaly onstant o postve v uesof grid . voltage On the oth h nd,
the utal condanc rs rpdlys the negatve bs s educed ndatns n ppoxmtey unfom
vlue the gd poive.
Fiue B shows tt th plate r-rent rises wh e fnt tempea-e echng stuatio abou te
ed men votag of he te.Te mplcton onstan s a maxi-
mum at the owest workabe lament
temperature nd fals o oe o
les nfomy as Ef i nceased Thplae resistance emns onsan
down to 4.S olts and Qn rises h
nceing apdiy s he lmen is
cooed. The mut condtne
urve, of ouse exhbis a epro-
ca cha esti.
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·For Al Ppua Mes
nd Cict�radio recivngsl
Type 45 Plte Suppy
I?RO,.ED qalty o eepion, ee m
axet causd b staily eerratg "battees is w possib hru the use f Gera Rah Pa pp.
hs u perates on 10 l ( 6 ce) C.and vdes laes f 45 9 30 and 20
Vltaes a eadil aaptable o all parmakes and ccuits f ao revrs by mans fxed esances hic ae tihty sea frmu �d moisre us elminaing othesomead nisy ednces varabe resstane ltagecontrols. The un s otaind n a meta as
with attracive black cysallne fnsh, and has acnel cate sicie ith BH atheon Te·-···6.
ype Power Ampi-fer and Pe Supy
THE pe s sma h abe desbeni ept hat it has dtina aur
o a e Amplie an ses the X-13 or
CX1 e e as a ecier sea ofhe aheonA er amplie i cojucio th h ae
up ts net us of a te h as audo se e ades of het terive a be pat by d ell o taea ubet n cn of he oee be spple b .C fo the snday t er rsrm e poer ercms e tndny tard b o eadigad ems he s mo use f <listi dseaker prain
The plae supy p is aes of 45 an9 r he cr ad l 0 dec o ube U X37) ohe wt thep bia f this bc ihu s····$6
GEN RL DIO OMPNY, ambrdg s
GENL R A DIO INS RUM
znd the Pals of r Bui S