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Thanks Boogiebabies---It is a Mark IIA. I appreciate your comments. I will check caps and tubes. I have a schematic and I'm pretty sure I can figure out the transformer wiring. I have a breaker on the AC line to keep any fault condition from damaging more of the amp.

I removed the power transformer because THAT was the item that was smoking. The mistake I made was that I didn't label the wires before disconnecting which isn't a problem except for 3 of the red wires. Fact is, the amp was given to me by someone who said if I fixed it I could have it. If you...

No, haven't checked the power tubes. I'll have to reinstall the transformer and unfortunately I didn't keep track of the red wires before snipping them. :cry: Well, live and learn. Anyone know which red wires go where? I know one is for the chassis, that's easy enough, but the other...

Oh, and the voltages on the red and green wires were in reference to the neutral AC.

Hello--I have a Mark II. Recently, I started playing it and it sounded fine. After about 15 minutes of playing there was some kind of surge of power. The power transformer started smoking (or at least I think it was the power transformer that was smoking) and then the fuse blew. So this...