There have been discussions about this here before. FWIW, I've replaced the glass fuses in both my integrated amp and my line conditioners with ceramic fuses and there was a subtle but audible improvement in sound quality in terms of smoothness. Notice I said subtle, not "jaw dropping" or incredible. But the cost to do this is very low and I feel it to be a worthwhile tweak. If you have fuses as opposed to breakers, a ceramic fuse is supposed to be better than glass, but I have had no luck in finding them for my fusebox. Plastic based fuses, though, do sound better than their glass counterparts in my experience, and once again, this is a tweak you can do for a few dollars or less.