Left channel gets quiet

[Dzrout]

Having some odd issues, starting today, my left channel will slowly fade out. When I turn the balance to the left it slowly comes back. Then I turn it back to center and it does out again. Thoughts. Tried multiple inputs. Going to try another power amp next time it happens.

 

[Doc B]

Have you tried swapping tubes side to side?

 

[Dzrout]

I didn’t problem did not follow the tube. It hasn’t done it in a while. But happened a couple times today. Next time it does it I am going to connect my other power amp and see if I can replicate it.

 

[Paul Birkeland]

A slow fade out probably would come with a change in voltage that could point where the issue may lie.  I would predict a flaky solder joint that is jostled back into operation when you move the balance control.