OK so when using my all-tube Ashdown Little Bastard suddenly I got a little electronic noise --- nothing hairy, sounded like a bad cord connection like you might get when you step on/pull your cable -- and then the volume dropped significantly. No amount of my usual go-to fix --- pounding on the amp with my fist --- made any difference or elicited any alarming noises. Turning amp on and off made no diff. Still get sound but not much power. Tone knobs have effect; volume has an effect. No bad smells or crackling. Guidance, oh my genius pals?