1970s PIONEER QUADRAPHONIC QM-800 AMPLIFIER & QC-800 PREAMPLIFIER vintage

Description

vintage Pioneer Quadraphonic Stereo QC-800 Preamplifier and QM-800 Amplifier
-- circa 1970s -- close serial numbers:
RD13065 &
RE13053 -- each is app. 12 by 17 by 5 1/2 in. high --
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the amplifier seems to work fine with just a little crackle issue with the decibel level switch / level meters all seem to work ok //// preamplifier works but has some issues: had to wiggle the tape monitor toggle switches to get it to work but when it works, it works very well with great clarity and volume -- the mode switch also seems to have some problems but no manual so am only guessing how this is set up --  four rca outputs have been added to the back of the amplifier as well [was hooked to an oscilloscope]
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we are always listing interesting items of Tech History
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