Hey, Im new to this site but i need help with my B52 AT100. Its basically a piece of junk. It was 800 new. its a triple rectifier and sounded awesome. The problem is, when i bought it from a friend, he said he blew a power tube, 6L6 GC, and it played for 5 min or so and then shut down. Its been looked at and "repaired" by a few guys. Im in school for electrical engineering and as sad as it is, we did VERY little with tubes. The amp will turn on and play for approx. 6 min and by that point, the power tubes are too hott to touch. They light up fine when its on standby but as soon as I take it off, they light up blue and there is a clicking noise, every time, coming from the side of the biggest transformer. The work done to it included 4 new Bugera (i know, JUNK) 6L6s, and 6 new capacitors including the big ass filter caps.

Id really like to be able to fix this amp. I know its almost ridiculous to ask help in trouble shooting with out seeing the amp in person but any advice on what to do on how/what to check would be great.

attached is the schematic and a photo of the power section