Hey guys, my rockerverb 50 combo is rattling loads when i play certain notes and when played loud, and ideas on what this is and how to stop it.. cheers
Sounds like power tube rattle, try pushing the power tubes in and make sure they are seated flat. Most of them have things like springs attached to the base of them to prevent rattle.
Take a pencil with a rubber eraser and touch it to each tube one at a time while hearing the rattle. If it stops when you touch a certain tube that's the one. Tighten that one in, but if that doesn't stop it it may be mechanical noise within the tube. I threw away a GT 12AX7 last week for that reason.