I bought the SR Red at a local meet as they were on discount. I am fuming due to wasting £50 on it. It is actually so bad it is not even subtle how it killed my amp's treble detail and extension. It was an What moment... and switched back a couple of times to the stock Bussman trying as usual the reverse position as well. No different. I wonder what materials they are using inside it? Straws?
I did not like the SR-20s very much, because they expand the sound stage to an unnatural and constant big size, mess up imaging and it was softening transients. All of which are wrong things to have, unless one needs those specific tweaks for whatever reason. But at least these were better than stock fuses in overall clarity and did some things well.
The SR Red however is a disaster sound wise in my system... Is it possible I received a "lemon"? I may not even be able to return it as with all the SR fuses they are slightly wider and get scratched as soon as inserted in the slot.
I have also bought the Russs Andrews mains "Superfuse". I haven't A/B'ed this one properly yet, due to how pissed off I was with the SR Red, but first impressions were good with the Russ Andrews compared to stock fuse.