A U D I O N I C S o f O r e g o n

RS1 •. • • . . • • • • .

Class A, DC-Coupled High-Definition

Preamplifier

Ti>,AyD«,,c S , | r« S o,, Referee • Standard FYeamplitie'i is i\ mce-t logical refinement in advanced preamplifier design. Wo lealee that most so-called "reference standard" products

' are capriciously annointed and, consequently, chose the clesig-

- . .< con f ide i . . » j . :-.< support it.

The PS • . • • 1 s;airlly to inni IV i • ' ;e

• ' icai leal ism with such * . r . u r v v Hint it give: , D a n appreciation of the recorded . performance. It manifests, t iroui h thi A K iionics System (f listenei centered technology the sublime lismi'mij pie i ui audiophile s havi mg sought

lb achieve this level oi perfo -mance, we embodied in the RS i leading-edge technology rarely envisaged in cost effective components. It employs a full comprehension of the impact electronic design has on our sensory perceptions, and it reflects meticulous attention to detail.

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"01)0101,' ; mo • ie designed pri , , 1 DC paiame- 1 go as. ig them were ized by severe limitations or complex:.. . adaptive circuitry The intrinsically linear IC 3 in the RSI are do sigi ed spec ifi ally foi high-ciefmn on audio e i\ HOI i nen ls OIK ire internally confi p e c for true CI iss A operation Class A design is employed throughout t h e R S L

l o w level .flrn.ilr/ is susceptible toRFI .radio froguenov inter-', teience), which causes subtle i--1 ov i o t o i -." r l 1 , jo ! y and - vivid C B inception at the worst The "balanced line"

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1% silver mica capacitors reduce is dse and microphonics 'The RSI lb D6dB quieter than m< st K L V in o - i desig is Comparable paits am used throughout the R31 All i onnectors irn luding switch contacts, are gold f lashed oi Cromalyn treated to eliminate rectification and other hazards. Its precision "pots" offer less than 17a tracking enoi

The Audionics of Oregon RS1 Class A, DC-Coupled State-of-the-Art Preamplifier

The RIAA network is computer designed, as is its conjunctive infrasonic filter. Both perform with exceptional accuracy. Deviations from the RIAA Standard response curve are not more than a remarkable -0.2 dB over the entire 20Hz-20kHz range. Insertion of the filter sharply rolls off the sub-sonic response of the RS1 below 20Hz, but without creating the "ripple effect" deviations found in the 30-100Hz region of most filter designs.

The merits of proper impedance matching between a phono cartridge and its pre-amplifier are well documented: minimized reflections, optimized signal transfer, and, improved accuracy. The requirements of cartridges vary widely, yet only a few designs offer "cartridge loading" options. Of these, most offer only resistive options. The RS1 provides both resistive and capacitive options, over broad ranges. Select ion is via con ­venient PC-mount DIP switches which assure circuit integrity.

Design elegance and circuit integrity keynote the develop­ment of the RS1 throughout. Elegance implies simplicity, and the RS1 is notably without electronic novelties which serve their own purpose or attempt to correct fundamental deficiencies. Yet the RS1 does have one circuit of special signif icance, to assure that each user can enjoy the full potential of its superb RIAA section. That circuit is designated "Axial Tilt."

It is readily apparent that a stylus/cartridge, from its design to ultimate mounting, has immense impact on disc play­back accuracy. Yet, critical as it may be, it is virtually impossible to precisely align a stylus without instruments. Vertical misalign­ment causes diminished channel separation and, worse, skews the image in a way not correctable with balance control.

We perceived the need for precise vertical alignment and developed our (patent applied for) Axial Tilt circuit. Despite its-significance, it's easy to use: mount a cartridge in the normal fashion, then, as an added step, null inter-channel cross-talk with a test record, which is suppl ied, and the RSI 's front panel Axial Tilt controls. Axial Tilt electron­ically compensates for mechan­ical misalignment errors of up to ±7° from the vertical plane. This compensat ion of stylus "tilt" realizes the full capability of the stylus and properly positions the stereo image. This image creates the "realism" in music; Axial Tilt is an integral requirement for high-definition performance.

An A C coupled preamplifier output has a capacitor which prevents passage of potentially dangerous DC current. Unfortu­nately, it also causes time dispersive phase errors in the audio signal. Removal of the capacitor creates DC coupling. Typical "DC-to-light" designs amplify both /nfrasonic record warp and supersonic transients (above 100kHz!). The DC coupled output of the RS1 achieves significant performance advantages in a more carefully considered manner.

It eliminates commonly used electrolytic and tantalum capaci ­tors, which exhibit voltage de­pendent capaci tance shifts and non-linear equivalent series resistance. An automatic relay mutes the output for three seconds to allow circuit stabiliza­tion after mains turn-on.

A - AXIAL TILT IN DEGREES -F R O M 0 0

STYLUS (FRONT VIEW)

RECORD GROOVE

As shown in this exaggerated example, the stylus/cantilever assembly is frequently not perpendi­cular to the plane of the record surface. Ideally, the stylus should be aligned vertically to insure equal contact with the left and right walls of the record groove for proper balance, as well as minimize detection of o.pposing-wall signals (crosstalk). Until now, the elimination of the last few degrees of this vertical alignment error has been virtually impossible without the use of expensive test instruments not usually found In the home of the average audiophile. Now this adjustment may be accom­plished quickly and accurately by using the front panel AXIAL TILT controls of the RS1 in conjunction with the supplied test record. NOTE: AXIAL TILT correction is a lett/righl vertical alignment adjustment and has no effect on the Vertical Tracking Angle (VTA) adiustment, which is a front/back vertical alignment.

High-definition Performance And Advanced System Flexibility

Most audio purists demand versatility, as well as high performance. So, the RS1 couples the customary "straight-line" controls with a complement of functions which imbue it with good system flexibility.

Two Tape Inputs are provided, with total recording, dubbing, and monitoring capability. Recording from any source is possible, as is dubbing in either direction. Program or tape output can be monitored through the system during dubbing, e.g., a record can be played, while a master tape is copied.

The RS1 incorporates a power supply which is consistent with the design parameters of its audio stages. Special attention has been paid to the effects of transient peaks - which can degrade dynamic crosstalk performance - on the power supply. The precision synthesized dual-tracking regulator tracks positive and negative voltages to within z.2 Volt, and reservoir capaci tance is about 5000 m.f.d. per supply rail. The power supply circuit is physically isolated to reduce hum and noise, and its extremely low source impedance assures excellent dynamic performance.

Stereo, Mono and Mute outputs are selected through a single switch. A separate A C power switch is provided. The RS1 (and any high-performance com­ponent) should remain energized whenever practical. The Mute output serves as "Off." A two color LED glows red with A C "On" in Mono and green in the Stereo mode.

Simultaneous "0" or -10dB level Main Outputs are provided. This permits full compatibility with any music system.

As one might imagine, the specif ic design techniques and electronics in the RS1 are far more complex than this brief description suggests. You may have noticed our sparing refer­ence to performance "specif ica­tions." We state them elsewhere for your examination and convenience.

It should suffice to say that advanced audio components such as the RS1 exhibit excep­tional specifications virtually as a by-product of the effort to achieve the goal of high-definition design: realism in music reproduction. The realiza­tion of this goal in the AUDIONICS of Oregon Reference Standard Preamplifier has been achieved through an exemplary dedication to listening pleasure and with consummate care.

The design integrity of the RS1 is exemplified by these state-of-the-art salient features:

Intrinsically linear C lass A amplifying elements. Advanced circuit topology.

Mathematically correct RIAA design. Flexible cartridge loading to assure precise and predictable response.

Modified DC design. Integral buffer filtering provides optimum bandwidth (15Hz-40kHz).

Axial Tilt circuitry. Optimized groove alignment accuracy assures superb imaging.

Advanced power supply. Extremely low dynamic impedance assures total freedom from instantaneous crosstalk and distortion.

Its predictably accurate musical performance virtually captures the elusive quality of that "straight wire with gain." To understand the pride in owner­ship it represents and to learn the real meaning of listening pleasure, see and hear the AUDIONICS of Oregon Refer­ence Standard Preamplifier soon.

RS1 REFERENCE STANDARD PREAMPLIFIER

MECHANICAL DESIGN The RS1 features separate audio and power supply circuit boards. The full surround steel chassis eliminates RF and hum inter­ference. A rack mount black anodized aluminum front panel with handles is standard.

FUNCTIONS Axial Tilt Compensates for mechanical vertical misalignment of the phono cartridge/stylus. Corrects for "tilt" of up to +7°. Front-panel controls.

Tape Monitoring Two Tape Inputs and Outputs are provided, with full capability for recording from Source; 1 - 2 and 2-1 dubbing; and separate Source monitoring during dubbing.

Output Select Front panel three position switch selects Stereo, Mono, or Muted output.

AC Power A separate A C switch is provided. Muted output is normal "Off." Two color LED glows red with Mono, green with Stereo.

FEATURES Input Selector The RS1 accepts three selectable Input sources: 1. Low level Phono (RIAA) 2. High level Tuner 3. High level Auxiliary

Balance Control A left right channel balance; control is provided. Precise electr ical/mechanical centering.

Stereo Volume Control Tracking accuracy is typically within 1%.

Outputs The RS1 provides several outputs: 1. Main simultaneous (500 Ohms

and higher) A. "0" level and higher B. -10dB level

2. 2-Tape (2.2KOhms and higher) Switched for two machines

A C Outlet (unswitched) 400 Watts

SPECIFICATIONS Description: RS1 The RS1 Reference Standard Preamplifier is an advanced C lass A design using state-of-the art topology, computer-designed RIAA network and buffer filtering, modified DC coupled output technology, and advanced power supply. Military grade components are used in quantity to provide exceptional reliability.

Phono Input: Sensitivity: 2mV min. Overload: 165mV min. Noise: - 8 2 d B ("A" weighted) (Standard "A" weighting) RIAA EQ Accuracy: i 0 . 2 d B typically, 20Hz-20kHz

Infrasonic Filter: 20Hz hingepoint, third-order filter, 18 dB/Octave slope. De-featable via PC-mount switch.

Cartridge impedance matching ranges, selectable via PC-mount DIP switches: Resistance (Ohms): 100K or 47K Capaci tance (picofarads): 47pf, 150pf, 250pf in any additive combination.

High-level Inputs: Sensitivity: 10OmV min. Input Impedance: 2 5 K O h m s

Tape Outputs: Output: 0.2V to 0.45V typical Output Impedance: 2 .2KOhm THD & IMD: Typically 0.01% or less Main Output: Source Impedance: 500 Ohms

Dimensions and Weight: Rack mount 19"W x 31/2"H x 7V2"D, 10 lbs. net ( 4 8 . 2 5 x 8 . 9 x 19 cm) and (4.5 kg).

Warranty: The Audionics Limited Warranty applies (three years)

Audionics policy is to continuously improve our products. We reserve the right to change specifications or details without notice or liability. Audionics is dedicated to high-definition audio. Our goal is to provide you with superior audio components at reasonable prices . . . and to do so responsibly. Our products share the virtues of accuracy and reliability.

This common-sense approach to audio excellence has earned Audionics a reputation you can trust. But the ultimate test is a demonstration. Hear the difference in accurate high-definition audio. Discover the value so many audiophiles have found. Experience Audionics.

AUDIONICS o f O r e g o n

Suite 160 10950 S.W. 5th Beaverton, Oregon 97005 (503) 641-5225

©1980, Audionics, Inc. Litho in USA 1/80 3 0 M