Ok, I have a Carvin MTS3200 Tube amp.. I'm thinking one of the tubes may be bad but I'm not sure. It still plays fine, except that it has a wierd sound when I play anywhere above.. like 1 lol. It rattles.. but.. not in a way that somethings loose. It has a metal'ish rattle sound. When I take a pencil and tap on the tubes, that's what the problem is, it's not something in the amp. When I tap every one it makes the same noise, so I can't pin point if it's just one tube or not. Is it time for new tubes? Or is something else wrong?
tubes usually last quite a while so it shouldnt break so easily, have to dropped the amp or something? do the tubes appear cracked or broken?
It did get knocked over at one time, but it didn't start doing this til about 3 months after it was knocked over. The tubes don't appear to be cracked or anything.
its probably a pre-amp tube thats making that rattle. Replace your pre-amp tubes and see if it goes away.