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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





Sansui R-70 receiver

Sansui R-70 is an AM/FM stereo receiver FTC rated 8ohms at 65 watts RMS per channel, 20 to 20,000 Hz, at a distortion no higher than 0,08% T.H.D. at any frequency
Features include a stereo beacon, three-step LED FM center channel tuning indicator, five-step LED AM/FM signal strength tuning indicator, leeft and right twelve-step LED output power indicators calibrated 0; 0,005; 0,01; 0,02; 0,05; 0,1; 0,5; 1; 2; 10; 50 and 80 watts into 8 ohms, and automatic copy (dub) from/to either of two recorders.
There are inputs for magnetic phono, Aux, and two tape. Outputs for two speaker systems, two tape, and phones.
Controls are provided for tuning, concentric-clutched left and right volume (labeled volume/balance), ganged bass, ganged treble, tape monitor/ copy selection, input selection and speaker  selection. There are switches for high filter, loudness compensation, and FM muting (auto for stereo, off for mono).
The FM antenna input is 75/300 ohms. An internal antenna and external connection are provided for AM. Switched and unswitched AC outlets are provided.
Performance
FM Tuner Section
Full limiting measured 6 µV. The monophonic high fidelity sensitivity (60 dB quieting) measured 13 µV. The stereo 55 dB quieting high fidelity sensitivity could not be measured because unusually high pilot and MPX subcarrier leakage blocked the test equipment at -38 dB. Full mute release was attained with 3 µV.
The stereo pilot and subcarrier leakthrough is high and requires the use of an MPX filter when recording with Dolby. This is no problem since all Dolby noise rduction systems have the MPX filter; if yours is switchable make certain it is switched in.
At standard test level the stereo frequency response measured +0,5/-0,4 dB from 20 to 15,000 Hz. Monophonic distortion measured 0,18% T.H.D.; stereo distortion was 0,35% T.H.D.. The Signal-to-Noise ratio measured 75 dB . Stereo separation was +40 dB. And selectivity was is good.
AM Tuner performance - background noise level was higher than average.
Amplifier Section performance
The power output per channel at the clipping level with both channels driven 20 to 20,000 Hz into 8 ohms measured 43 watts RMS. The Frequency Response at 43 watts into 8 ohms measured +0/-0,6 dB from 20 to 20,000 Hz  at a distortion no higher than 0,065% T.H.D. at any frequency.
The tone control range measured +11/-12 dB at 50 Hz ; ±10 dB at 10,000 Hz
The magnetic input hum and noise measured -58 dB; stereo separation was into the noise level.
The output power meters are broadly calibrated - 1; 10; 100 watts, etc - and are reasonably accurate at the calibration marks. The Frequency Response of the meters is essentially "flat" 20 to 20,000 Hz, and can be relied on for tests if the reference is one of the fast rise and a slow decay, providing a form of semipeak indication.

Overall dimensions are:  16-15/16" (wide) 5-13/16" (high) 9-1-16" (deep)
Weight is 16,5 lbs
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