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Rarest Challenger Ever?
I have a Bogen Challenger CHA 75A Pa amplifier dated 1974, I need a schematic, ive found the schem. for the CHA 75 but not 75A, it has 2 power tubes instead of 4 like the 75. Im a guitar amp builder and this thing just baffles me. Id like to change the preamp to a more guitar friendly layout, 5f6 or 5e3, but the power section is crazy on this thing. Any help would be greatly appreciated. thanks in advance.
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