Re: Looking to replace tube in my AVT50 Combo
I think a JJ ECC803S would sound great in that amp.
But, I think the issue you are dealing with is a dirty volume pot.
Time for some tuner cleaner, or electronics cleaner and lube.
Replacing that tube wouldn't be a bad thing. If you do, tell us how the tube effects the sound. It would be interesting to see how a tube change effects that amp.