Fuses are not part of the active, tone producing circuits in any amp, and are simply designed to allow current to pass through them and fail immediately if necessary to save the circuits from frying. Although SR fuses have a cult following with astonishing claims of transforming the tone quality of amps, I've tested these (SR Black) and found these claims to be nonsense, even while providing the weeks of break-in (!). In fact, after my little comparison to the Littlefuse (and other generally stock fuses) products I've used for years, I discovered an SR Black had been left in my amp for months, which I replaced with the original Littlefuse with zero change in tone. Try asking anybody how these little graphene enhanced seriously overpriced tiny wire devices actually work (magically coat the electrons with Special Sauce?) and prepare for scorn. The SR business model seems to be "money paid equals results experienced" even when the products are laughably unnecessary.
