So here's the situation... About two weeks ago, the fuse fell out of my Mesa Studio .22+ and was promptly run over by a vehicle. Since it is impossible to find a new fuse cap (the spring loaded cap that screws into the amp), Mesa sent me a new fuse assembly. Last night, an electronics guy and myself pulled the amp out of the cab and replaced the fuse holder. Today I turned the amp on and after about 10 seconds the fuse blew. Replaced the fuse, same thing. I'll check to see that the tubes are seated properly (though it sounded fine for the few seconds it played before it blew). Any other ideas of the cause for this?