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I knew Gene Czerwinski and watched him build amplifiers in his garage in the San Fernando Valley. I am almost 100% positive that you won't find a diagram anywhere for that unit.
Having said that, Gene was not particularly an inventor, so his amplifier (I didn't realize he had built a guitar amplifier) probably was just a standard circuit.
I knew him in about 1956 or 1957 when he was an engineer at Bendix and did this stuff in his spare time for fun.
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