Where did this amplifier board came from (VINTAGE!)

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Here is the schematics of the Russian clone. It is pretty much the same as the original.
As that amp is running only on +/-24V, some resistor values were changed, the dropping resistors for the Zeners and resistors in the current limiter stages.
One interesting change is that the pole of the low-pass filter after the op-amp was moved up by a decade.

Peter
 

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