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

Sony TA-70 amplifier

Integrated Stereo Amplifier
A compact amplifier at a sensible price incorporating all the features necessary to form the centre-piece of a complete hi-fi system. Designed for combination with the ST-70 tuner.

This integrated stereo amplifier, model TA-70 combines performance with economy. A sensibly priced unit which has been designed with all the experience that has made Sony world famous for quality in hi-fi. Features include, selector for magnetic or ceramic cartridge, tape/source monitor switch, headphone jack, DIN connector socket, high filter switch and facilities for SQ quadrophonic sound by connecting model SQA-200 decoder amplifier.
Styled to match stereo tuner ST70, model TA70 is surely a sound investment.
Rated Output:  8 watts per channel, both channels operating load 8 Ω at 1 kHz
Power Bandwidth:  30 Hz - 20 khz
Total Harmonic Distortion: 5% at rated output power
Inputs Sensitivity/Impedance:
Phono 1 :  3,5 mV/50 k Ω
Phono 2 :  300 mV / 1 m Ω
Tuner :  250 mV/100 k Ω
Aux :  250 mV/100 k Ω
Tape :  440 mV/100 kk Ω
Rec/Pb :  440 mV/100 k Ω
Outputs Level/Impedance
Rec Out :  250 mV/10 k Ω
Rec/Pb :  30 mV/80 k Ω
Tone Controls:
Bass :  100 Hz ±10 dB
Treble :  10 kHz ±10 dB
Loudness Control :  100 Hz + 8 dB; 10 kHz =4 dB ( att -30 dB)
Filter : 
High :  3 dB/oct above 5 kHz
Circuit System:  Quasi-complementary symmetry circuit
SEPP OTL:  amplifier
Semiconductors:  20 Transistors; 2 Diodes
Power Requirements:  AC 240 V 50 Hz
Power Consumptions:  70 watts
Dimensions (W x H x D):  330 x 87 x 245 mm (13" x 3-1/2" x 9-7/10")
Weight:  2,8 kg (8 lb 6 oz)

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