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AMPEG Bt-15 problem !!!!!!

Hello there !

I have a Ampeg BT-15 (solid state/trasnsitor) with problems !

The sound is distorted and it comes from the power stage (the preamp seems to be OK) !

does anybody here have the schematic of the Amp ?

here are the part nb of the boards (Preamp: 64-60-054C / Power Board: 64-60-060) .It seems that the transistors are not the right Ref, so I need the diagram !

Thank you guys ! ;)