My opinion about Fuses is that they are not part of the tone circuit and common sense would say that they cannot improve the sound. Maybe it would be a good one for a blind test. However, it would be hard to disguise them.
I can make power cords, cannot make fuses. I agree about IC's and Speaker Cables, they do make a difference, but again, I wouldn't spend crazy on them. I do have some AQ Gibralter's, but I got them used...
Jim
I've tried many power cords, expensive, inexpensive, proprietary construction, different metals and materials. There are so many on the market today, that it's possible to get three in a row that are mediocre sounding or even bad sounding. then the opposite may happen, three very good ones with the third one being a little bright.
With that said, I get the best results from audio gear by selecting power cords, interconnects, and power conditioning ( one of them is the UberBuss ). These three are above all the tweeks I have tried, which range from an OK improvement to absolute fraud and false advertisement. I won't mention any companies right now, but you can ask.
Regarding the "good" ones (tweeks), ALL of them make a Small difference for the better. Which brings me to specialty fuses. I hated to do it, but I bought five different brands of audiophile fuses. To make a long story short, they change the sound similar to power cords ( from worse to mediocre to good ), but affect the sound about half as much or less.
So I would say forget the fuses and dial your system in with cables and power conditioners. If you insist on special fuses, Acme sells cryoed ones for a low price, and PS Audio a jump higher.
Two tweeks I haven't tried, and therefore cannot say how well they work, are the Stein Harmonizers and the IPC Proton alignment products. They both get good reviews but will cost a minimum of $4K to get "started".
Best of luck, and fun !