Stereo Integrated Amplifier (1975-77)
Hybrid IC circuitry employing dual positive and negative power supplies is incorporated in the power amplifier section of the SA-7300. All stages are directly coupled in the OCL circuit design to provide plenty of power at minimized distortion. Output is 35W + 35W in the range of 20Hz-20kHz at 8 ohms with both channels driven and 0.3% harmonic distortion.
The equalizer amplifier also utilizes a dual positive and negative power supply and IC circuitry to assure RIAA deviation within +0.3dB, while a maximum input of up to 200mV (at 1 kHz) can be easily handled (at 0.1 % harmonic distortion).
Both relay and electronic circuitry combine to safeguard valuable transistors and speakers in event of malfunction. This special protector circuit also performs a muting function to prevent annoying surge noise when the POWER switch is operated.
Advanced CR type tone controls and 2-stage direct coupled amplifier provide highly effective control operation. Regardless of the tone control settings, a flat frequency response can always be obtained by employing the TONE switch. This is convenient for checking cartridge and speaker tone, and evaluating listening room characteristics.
The recording and playback jacks of the SA-7300 are provided for two tape decks, in addition to separate Tape Monitor switches. Extremely convenient tape duplication and editing can be performed if two tape decks are available.
The clean uncluttered front panel layout avoids a confusing array of unnecessary controls and switches. Modern serene styling is combined with one-glance operational ease.
Power output: 35 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 50kHz
Total harmonic distortion: 0.3%
Damping factor: 25
Input sensitivity: 2.5mV (MM), 150mV (line)
Signal to noise ratio: 70dB (MM), 90dB (line)
Output: 150mV (line), 30mV (DIN)
Semiconductors: 4 x IC, 20 x transistors, 16 x diodes
Dimensions: 350 x 125 x 282mm
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Reviewed May 31st, 2015 by maxbertola
I owned this small amp from 1975 to the late 80s, then moved to British audio.
Recently I have bought another, from 1975, to replay my old vinyls, because of the narrower panel and of course for sentimental reasons. It still sounds surprisingly good, clean, with decent bass, good image, not harsh at all but lively enough to be appreciated by ears 'spoiled' by 40 years of costly audio. The potentiometers and the switches, safe for a few noises that will be fixed with some good spray, are tight, the input selector had a strong clamp on the three positions, and the amp looks as good as it could be with 25 or 30 years less on its shoulders.
Indeed, a lovely amp.