nonoise. . . I tried out three different fuses that I had laying around on my Kinki EX-M1 integrated. They all sounded different.Coincidentally, I recently did the same thing with my Class A SS amp. I have the stock glass fuse, a SR Black and a SR Blue - all burned in. Changing the fuses was almost like like tube-rolling. Very subjective.
For the past few years, I’ve been tweaking the cabling and power conditioning. As the power gets cleaner and cleaner, the effect of the fuses becomes more obvious. A well-mic’d piano is the reference for my listening. I’m leaning going back to the stock glass fuse. TBD.