A fuse Is a fuse. It does one thing, it blows if there is an issue to prevent the rest of amp from turning into toast. I would never open anything up and screw with it. You are just asking for problems. No one is going to differentiate one fuse from another as far as sound Is concerned, it's pure bs.
So done with audiophile fuses
The journey started with a medium priced ($50) fuse in my power supply. A failed rectifier tube blew that one out. Not a fuse problem. Next up was a blue fuse in my pre amp. It blew and was not caused by a pre amp problem. Apparently they sometimes are more sensitive and it was replaced by an orange fuse two values higher. Things were going along fine. I replaced the pre amp with a newer version of the pre amp and it has the same fuse value. Five months latter (today) I turn on the pre amp and nothing. it's a five month old pre amp so I suspected that it was the fuse. Sure enough, I replaced it with a ceramic Littelfuse of the lower correct value it works fine. No more wasting my money on unstable fuses for me.