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Gibson 300 RVT amplifier, how works compression switch?

I've owned one of these amps and have studies the schematic. Cannot understand how the compression switch functions!!

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torokj
torokj picture

Hello BillB,

From the output, as feedback signal controls a light source, which controls a photoresistor. This photoresistor  is a part of  the voltage divider, which controls the gain.It works as a dynamics compressor.The switch disables this function 
tj 

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