1972 Peavey 400 series power module - I'm in over my head

[Guitared]

Hi everyone.

I need help with my peavey. I seem to have a burned out driver transistor and a number of burned out resistors. I have a similar peavey model that I hope I could harvest for parts. The donor is a peavey 240 standard. I need your help finding the right wiring diagram and figuring out if a transistor transplant is even a possibility. I will include pics ASAP. peavey pa-400 peavey 240 donor amp

[Guitared]

Forgot to mention that the pa-400 powers on and even outputs a weak cracky signal at this point. I am hopeful, or maybe just completely ignorant, i don't know which

[Jazz P Bass]

Not sure if that is an A or a B Pa 400.

It appears that your negative side driver got a little hot.

I would check the output transistors for shorts.

For sure check the negative side.

Also check the 0.33 cement resistors for any that may be open circuit.

[Guitared]

Holy 'molé- you are a golden god! Your kung fu is best.

[52 Bill]

The photo of the burned board is upside down. The resistors burned and the smoke has risen up to the driver transistor. The driver may be dead, but i don't think it was the source of the fire.

Clean up the board and assess the damages with a meter, not your eyes.