This is my own drawing of the 811 POP Stereo amplifier module. The first version uses Ge and Si Transistors. It seems as if it was manufactured in Italy. Later on the 811 POP Stereo amplifier was re-designed using integrated circuits instead.
POP Stereo 811 circuit diagram
POP Stereo 811 PCB top view
POP Stereo 811 PCB bottom view
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