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

Revox A 50

Revox A50 Stereo Amplifier
The A50 amplifier is a unit of central importance within a hifi music system. Its power handling capacity is a decisive factor for high quality sound reproduction from tape, disc or off the air. For this reason, extremely careful attention has been given to every design detail of the Revox A50  Stereo Power Amnplifier, whose sine wave rms rating of 2x40 watts will satisfy the most discriminating demands. Silicon transistors are used throughout its circuitry, which is made up of pluggable PC-boards. From the softest sounds up to the rated output power, distortion remains negligible. pre-set level controls eliminate any volume changes when switching between different signal sources. A separate button provides for off tape monbitoring through the power amplifier. Step-type bass and treble controls permit exactly reproducible settings for each channel, as well as a defined Linear response. headphone outputs and switchable filters round up the many distinctive features of the outstanding revox A50 Stero  Power Amplifier.

Continuous Sine Wave Output:  2 x 40 W at 4-8 Ω  ( 2 x 25 W at 16 Ω )
Music Power:  2 x 70 W at 4-8 Ω  (2 x 40 W at 16 Ω )
Distortion:  less than 0,1% at 1 kHz (less than 0,3% from 40 Hz to 15 kHz)
Intermodulation:  less than 0,3%
Frequency Response:  20 Hz - 20 kHz ±1dB
Powertbandwidth:  10 Hz - 40 kHz
Inputs Sensitivity/Impedance:
Micro :  3 mV/100 k Ω
Phono Magnetic :  3 mV (2 - 7 mV) / 47 k Ω
Tape, Tuner :  100 mV (better than 90 mV)/ 100 k Ω
Auxiliary :  100 mV (better than 90 mV)/ 330 k Ω
Phono Ceramic :  230 mV (better than 180 mV)/ 800 k Ω
Tape Monitor :  250 mV (better than 180 mV)/ 50 k Ω
Signal-to-Noise Ratio (unweighted),
At nominal sensitivity reffered to 40 W, 8 Ω load
Phono :  better than 65 dB
Tape, Tuner, Aux :  better than 75 dB
Tape Monitor :  better than 80 dB
At nominal sensitivity reffered to 50 mW, 8 ohm load
Phono :  better than 50 dB
Tape, Tuner, Aux :  better than 50 dB
Tape Monitor :  better than 50 dB
Intrchannel Crosstalk:  better than 60 dB (1 kHz)
Damping Factor:  better than 20
Tone Control (4 dB steps):  ±12 dB at 60 Hz; ±12 dB at 12 kHz
Low Filter :  -8 dB at 60 Hz (12 dB/oct)
High Filter :  -15 dB at 12 kHz (12 dB/oct)
Loudness Control:  60 Hz : -5 dB/1 kHz: -16 dB / 12 kHz : -12 dB
Phono Equalization (RIAA):  ±1 db / 50 Hz ... 15 kHz
Power Supply:  110,130, 150, 220, 240, 250 V 50/60 Hz
Semiconductor Component:  30 Silicon Transistors;  3 Silicon Rectifiers;  14 Diodes
Dimensions (W x H x D):  415 x 160 x 245 mm
Weight:  8,2 kg (18 lbs)

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