If things such as a simple fuse make so much difference then why are they not part of the design and manufacturing process.
Its like getting a car with OEM tires... you want sport? You have to add them. But, if you get a sports car? Then they better have them. High end companies are aware. For example, PS Audio uses audiophile fuses in their equipment.
A complete engine or construction tubes which are different to a piece of wire...if 20mm of wire can make your equipment sound different and you can hear it then all the power to you and your bank account. I would be bitching to the manufacturer for short changing you in the parts and ultimate performance of your amp for the sake of a fuse or 2.
Its all about the wire inside the fuse. There are vibrations that take place within a fuse. Ceramic fuses cancel some of the vibrational effect. Just like "tube dampers" are sold to place over tubes. The type of wire material will effect the sound as well.
Anyway we all have our opinions and mine won't change yours or anyone else's so let's leave it at that.
I have my ears. You have opinions?
And yes I have tried different fuses and even bypassed them totally just in case you are wondering.
Prove that after 100 hours of listening you can stake your life on it sounding better...why must it always be better, different perhaps? Because you think it better otherwise you just threw a chuck of money down the toilet. Even Jason I think will draw the line ...my mind is open but I have never heard such changes from a fuse in my life and I don't expect to hear any any time soon.
Its all about transparency. Without it? Be content. Power cables... interconnects... fuses. They all can make a difference. But, only if they can be detected.