R25 smokes in tse 300b

[pbkrag]

My TSE sat Idle for some years because I was having issues with it and and only now getting back to get it running again.

this TSE is setup for 300b tubes.

I powered up with just a rectifier.

b+ 440
b- -175

After some a few min. R25 smokes. I replaced R25 and R14.

Figured I should start out with the proper checkout steps.

Filament voltages were 4.95 each
again b+ 440, b- -175
Grid of right output tube is -58
Grid of left output tube is +350 and slowly climbing

With rectifier in after a few min. r25 starts to smoke again.

I measured across r25 and getting over 600 volts.

So, where do I go from here?

 

[Tubelab_com]

The mosfet connected to R25 (Q2) is shorted. Replace it.

 

[pbkrag]

Replaced q2. And no more smoke. Thank you.