Tube Amp Archive

I think I would be looking at the screen resistors.... Are they there? Correct values?? It is hard to argue against 1K 5w resistors here. John Are you talking about the resistors mounted on the tube sockets (pin 4?) If so I replaced those with new metal film ones. I think with just the same values ...

No pin 3 is the plates or output to the output transformer. The screen grid is pin 4. You should have less voltage on the screen than the plate or it can stress the tube. I think the voltage there may be pretty close to the plate since it uses a choke before the screens. How was the recap job? Has ...

This is my first amp project so you will have to excuse my limited knowledge. by screen voltage do you mean the voltage at pin 3 of the power tube socket?

Hello, I have a 67 AB 165 Fender Bassman head that is blowing tubes. I recently replaced all the electrolitic capacitors, and biased the tubes. Any suggestions for testing this amp? This is my first amp project and I am wondering why the amp is blowing power tubes. The first tube that blew was the s...