Web the schematic just shows one input jack with 27k value & i added some 470 ohm resistors to the 6v6 screens. Web schematics the .ps postscript file may yield the best picture, if you have software to display them. The gibson is much more along the lines of a tweed fender.
Gibson GA18
G40 musical instrument amplifier pdf manual download.
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Unless you have and want a museum piece, it will need. I think it would make sense. Web view and download gibson g40 schematic diagram online.
Web Gibson Ga 18T Amplifier Schematics Manual Amp User Manual:
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