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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Dynaco SCA-35

 The SCA-35 is a one piece combined pre and power amplifier. It is the best value of all the Dynaco components and can deliver half again as much steady-state power at the audio extremes as many other units adbertised at twice the wattage.
 Features
1) Input selector for phono, tape head and three high level sources
2) Exclusive bandpass filter eliminates rumble and scratch without destroying the musical balance
3) Functional, easy to understanad controls make it easy for the whole family to use, with sufficient flexibility for the enthusiiast's subtle adjustments.
4) Speaker terminal connectors provided for driving a center speaker, no other amplification required.
5)Inputs for low and high output magnetic cartridges as well as ceramic cartridge provided
6) Three preassembbled etched circuit boards reduce assembly time, no adjustments of any kind are required
7) Specially engineered Dynaco output transformers have phase reversal frequency in excess of 300 kHz to provide complete stability regardless of speaker load.
8) 120/240 V AC power transformer available on special oreder for overseas use.
 The SCA-35 is a completely proven amplifier. Since its introduction in 1963, literally tens of thousends have been built from kits or acquired factory assembled. Even though an integrated amplifier, it maintains Dynaco's reputation for easy -to-build kits, as attested by High Fidelty Magazine: "Building the SCA-35 offered no problems, and several hours of pleasant diversion, to the kit enthusiast. The printed circuit boards are supplied with parts already mounted, and wiring to them and to the rest of the chassis is fairly simple because of the happy absence of crowded areas. The instruction manual is clearly written and excellently illustrated. Total working time was eight hours."
  The result, the magazine went on, "… is, in a word, an excellent amplifier - especially so in view of its cost"   Kit price in 1971 was $ 99,55 for East and $ 104,95 for West.
Specifications
Power Output: 
35 Watts RMS both channel driven at 1000 Hz
28 Watts RMS both channel driven at 20 - 20,000 Hz (either channel alone 17,5 Watts RMS from 20 - 20,000 Hz)
Harmonic Distortion:  under 1% at rated output
Intrmodulation Distortion:  under 1% at rated output
Both Harmonic and IM Distortion (decrease as power is decreased): blelow 0,2% at average listening levels.
Frequency Response:  20 - 20,000 Hz ±0,25 dB
Tone Controls:  ±12 dB at  50 Hz and 15 kHz
Input Signal Required (for rated output at 1 kHz):
Phono Magnetic : 4 mV
Tape : 2,5 mV
High Level : 1 V
Hum and Noise:  70 dB below 10 mV on low level inputs; 80 dB down on high level inputs
Front Panel Controls:  Selector, Volume, balance, Bass and Treble
Front Panel Switches:  Stereo/Mono; Loudness compensation; Bandpass filter; Power
Rear Panel Inputs:  RIAA magnetic phono (high and low level); NAB 7½" tape head; Radio; Tape and Spare
Rear Panel Outputs:  8 and 16 Ω speaker; Tape output (unaffected by balance tone and volume controls), Center channel output (no auxiliary amplifier needed), provision for headphone connection, two AC convenience outlets.
Rear Panel Controls:  Dual hum balancing pots
Tube and Semiconductor Complement:  2 x 12AX7, 2 x 7199, 4 x 6BQ5, 2 silicon diodes
Power Consumption:  100 Watts at 120 V, 50/60 Hz (120/240V powertransformer available on special order)
Dimensions  (W x D x H):  13 ½  x 10 ½ x 4 ¼  inches
Weight (shipping):  20 lbs (9,1 kg)

Cover Included:  Charcoal brown baked vinil cover

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