Technics SA-5600X
Documentation on the Technics SA-5600X is thin. The surviving record is essentially one period source. In its receiver coverage, HiFI-Stereo (1974, p.106) treated the SA-5600X as a four-channel receiver with a built-in universal decoder. The decoder handled both discrete and matrixed (synthesized) quadraphonic program material.
The same review recorded an FM section rated at 1.8 µV for 30 dB quieting, with a 1.5 dB capture ratio. Magnetic phono and microphone inputs are listed at 3 mV, and the aux plus three tape monitor inputs at 200 mV. It also lists 75- and 300-ohm antenna inputs, a main/remote speaker switch, and a joystick-type balance control.
Beyond that review, production years and original pricing for the SA-5600X are not documented in the usual archives. The period review lists 240 W total with one channel operating. A brochure or owner's manual in a reader's collection would fill a gap in this record.
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