Just thought I would post this incase any of you have come across this
My powerball's signal is after getting weak, not in volume, but it is that kinda sound like I have a dodgy guitar cable, or a battery is running low. But I have checked my guitars, my leads, changed the power amp tubes and still nothing
It is most noticable on the clean channel, it sounds like a noise suppressor is on it and the signal cant 'break through'.
Im thinking maybe a dirty joint at the input stage?
I am going to go with bad preamp tube, becuase I have had similar issues with my 5150. Fortunately for me, I was able to burn in the cathodes a bit and it fixed the issue. If you have some spare tubes on hand run them around though the various slots. If that doesn't work, I would go and bet its a cold solder joint somewhere in the signal.