Russe41, I'll bet they use common fuses.
I'll also bet you could venture to the local Porsche dealership and find less than state of the art tires on the prettiest model in the showroom.
What?
Something less than the best possible choice for maximum performance? Were talking about a very fine quality, very expensive automobile!
Maybe the tires they choose cost less, ride smoother and last longer at the expense of not being the absolute last word in performance.
I get tired of that argument, it appears all the time in Audiogon forums. People claim that if fuse (or fill in aftermarket product here) was important, the designer would have included it.
It's odd that every year at CES these same designers show up with their equipment sitting on premium stands and feet, hooked up with aftermarket interconnect and power cables and (in some cases) the room is acoustically treated.
I have witnessed (personally) tube equipment at CES that had all NOS tubes to give the performance edge they wanted the public to hear. If designers believe in and make use of all these things, why don't they include them?
As stated above, its the money.
Better to keep initial cost low and allow each audiophile to decide how to spend their post "initial purchase" dollars.