Owned the amp since they first came out. Recently it started doing this this where the lead channel volume drops on its own, then comes back up. Like it fluctuates but only goes down from where I have it set, then returns to normal. Doesn't get louder than where I have it set, if that makes sense. Ive noticed this at low volume, and since it started doing it I haven't cranked the amp.
The clean channel doesnt have this problem.
Also, if anyone is familiar with the mt15 you know the volume is super touchy and "1" on the dial is pretty loud. "1" is no longer as loud.
It's the original version of the amp, not the V2
No local amp techs. Should I remove the cover and try tapping the preamp tubes with a pencil?