Help Troubleshooting Super Sonic 22 - Crackling, Strange Reverb Knob Behavior
I've got a Super Sonic 22 combo that's got some issues that I hope you can help me suss out. It makes some pretty bad crackling/farty distortion sound as soon as it gets above a certain, not very loud, level. The reverb knob causes the overall volume to drop as you turn the reverb knob up. When the reverb knob bottoms out, the amp starts squealing. Tapping on any of the knobs causes a scratching sound, as does tapping on the power tubes.
I tried using Gemini to help me debug this, but it's sprinkled enough obviously erroneous info in the chat that I don't trust it. Regardless, some things it directed me to try were:
Patching the Effect Send directly to the Effect Return (didn't change anything)
Swapping the positions of the power tubes (didn't change anything)
Reseating all the tubes (didn't change anything)
I don't have a separate set of power tubes to swap in, so I haven't tried new ones.
Any ideas on what could be the issue? Faulty tube socket maybe?
I got this amp couple months ago in a lot of other gear, and it's been like this as long as I've owned it, so I can't speak to how/when the problem may have started.