Why do one side of tubes in my VH4 redplate?

[peterc52]

Any idea? Tried 3 different sets of tubes

 

[SpiderWars]

Sorry to state the obvious but if it's doing that with 3 different sets it needs to go to a tech. Usually those two tubes share a bias voltage feed and the other two tubes share another bias voltage feed, so it could be bias related. I'm not familiar with that amp tho. A good tech should be able to figure it out. Good luck.

 

[John4021]

VH4 AMP?......OOPS,didnt read the title that states a VH4. My bad.


burnt resistor . Your closer that us USA Diezel owners to send it to the Big Papa at Diezel HQ


By the way, have you used that bias probe for other amps?
Just making sure its not screwing up

 

[Rocker68]

Duplicates the situation when moving the bias probes to the other pair ?
If your comfortable , check the resistors in the bias circuit . Verify Bias pot working as it should .
I think SpiderWars and John got this .
Could be relatively simple ??