If you know your amp is OK, temporarily replace the fuse with a jumper. If it doesn't sound different save your money. And don't forger to remove the jumper!
do fancy fuses help?
wondering if there is any consensus whether expensive fuses, e.g. hi-fi tuning ceramic, really do help and are worth the money. is it like power cord voodoo (that is, they can make an audible improvement, logic be damned), or is there a theory behind why they might improve things? My amp uses 6 fuses, so a $250 experiment is only "cheap" upgrade by our insane audiophile standards.