I sent an email to B.K Butler audio, their tech said B.K has the schematic in his archives but is gone until monday, if I get one I'll share it here if I can.
Just an update of anyone is following, I never got anywhere with bk butler's tech, might send another email tomorrow and ask 1 more time, someone else has been in the amp and I'm not sure about some parts in the channel switching (jfets j112) seem to be doing the opposite of what should be there.
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