I've gone through every scrap of info I could find, including the one here that shows a schematic but came up empty. The schematic that's shown here is really tiny and if you enlarge it can't see any info. Does someone have a better copy or perhaps a full copy showing layout on the pcb. Bought this thing used with a hum issue and it really sounds nasty and dirty, looked at the board and alot of solder splash and really poor components. If they are real then they probably didn't pass any type of QC approval, resistors look like they were made by a 5 here with playdow and so called mkp caps have such poor printing that I doubt if they are real. Any help is appreciated,thanks.