SO- I've got here the eq & input schem for the 2203kk jcm 800 Kerry King. Anyone who knows this amp has heard the "beast" on it and it's switchable gain boost.
Marshall Schematics - Tube amp Schematics
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Marshall JCM800 Model 2204 Power Amp
PI coupling caps 2103 | Marshall Amp Forum
MARSHALL JCM 800 LEAD SCH Service Manual download, schematics, eeprom, repair info for electronics experts