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Ok, I decided to gut this thing and see what I can do with it. I've serviced many Mesa amps, and there are a lot of things that bug me with the design that I want to rectify. Since I have to start from scratch with nothing but the output transformer, power transformer, and EQ inductors, I have...

Thanks, I think everything you wrote is spot on! I did manage to get through to Mesa service, and they said that according to their records, it left their factory in late 1982 as a non-reverb, Mark 2B 15" combo amp. Given the markings it was probably built for Brad Gillis, a signature artist...

Pics.

That schematic has a strange connection for the bottom two tone pots (bass and middle), which is different from the JB schematic earlier (and the original Mesa one). Can anyone confirm the SLOClone schematic arrangement is correct?

I came into possession of a Mark series amp (it's non-functional, and was purchased for parts) that I can't seem to identify. Someone before me made a complete mess of the inside (cutting up and rearranging the preamp board, etc), so I can't make heads or tails of what it should be. The serial...