i used to have an old session amp many years ago that used to cut out took it to guitar village in farnham and the bloke who did repairs remedy was to solder the internal fuse into its holder?the fuse never blew in first place! it was a mosfet fault of some kind, anyways amp never was repaired but i learnt my lesson and after invested my money into a trce elliot ah300smx which i still have today