So I'd like to thank Richard for making aware about SR Red fuses because I'd never heard of them before.
Wait until you try them in the BHSE!
Shame there's 4 to change though. And shame that they're almost the most expensive ones available. Replacing 4 is around the same cost as a new set of premium tubes. IMO the SQ improvement is broadly equal to (but more neutral than) a significant tube change. I've extrapolated that opinion from just the 2 output fuses - yet to try the inputs.
Not everyone likes the Reds - see the last couple of pages in the fuse rolling thread in Accessories forum - warts and all.
I've had 2 positive PMs from other headfiers - So if this is all in my imagination, then others are imagining the same thing.
And yes, I know all about the SR HOT controversy, but the fuse is the only SR product I've ever tried - I generally avoid companies that use words like "quantum" in their marketing blurb.