There is some disagreement regarding fuses being directional due to the fact that they can't be (AC…a wonderful thing). Otherwise, caution is recommended when using SR fuses as they can blow if you don't use one rated higher than what the amp designer recommends (I had one do exactly that), and if using one rated higher you may blow up the gear or at least invalidate the warranty. Having thoroughly tested SR fuses in my rig, I can recommend Littlefuse products (now there's a cheap tweak!) as it would seem that "high end" fuses don't actually improve anything except the bank balance in the seller's account. Look up SR's (or any other "magic" fuse manufacturer's) explanations of how these fuses were developed and how and why they work to improve the sound of components beyond the all important Melting if Necessary, and you will find nothing.
