^^^WORD^^^I remember thinking my 200 was rattling. It was something else in the room. It sounded like it was coming straight from the amp, but it wasn't. If you have a chance, take it outside or in a completely different room. It is at least worth a try sometimes. The 200 can move some stuff. Or it could be something so simple as a wire vibrating sympathetically inside. I've had that happen behind the speaker on an amp with something vibrating. Hope you get it figured out and find it is something easy. Does it do it with Vintage off? That button adds a ton of lows.
