Fuse upgrade from factory.....

I recommend getting your equipment repaired so that something as insignificant as a fuse makes no difference. 

 Paul McGowan of PS Audio has stated at his website that fuses do make an audible difference. I certainly heard a nice improvement upgrading the fuse in the PS Audio Direct wave Transport and also their DAC.

I have replaced the original fuses on my three different Pass Lab amplifiers with the Synergistic Research Black fuses, and in each amplifier their was a significant sonic improvement. I have since upgraded to the SR Blue fuses but there is a great price to benefit ratio with the Black fuse.
 I have tried the Isoclean, Hi-Fi, Padis, Furutech, and SR 20 fuses and all of these fuses make a small difference. The Synergistic Research Black and the Blue fuses have a much greater and better effect than these other fuses I have tried.
I have spent several hundred hours comparing fuses and the above is a simple and condensed summary.
David Pritchard

Thanks all for the suggestions. I may just try the S.R black from The CableCo. 

Don't mind koost. He's a First Watt nut job. By the way, the very same recording engineer bought a First Watt amp some time ago and said it was one of the worse sounding amps he's heard. 

All the best,
Nonoise

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.