I have (3) HIFI tuning fuses in my system and it did make a noticable postive improvement in the sound (cleaner and more detailed) but bypassing the fuse and fuse holder all togeather (going fuseless) provides far more sonic gain. When I removed the fuse from my cat JL2 amp, Jadis preamp and a fuse on my dynavector phono headamp the upgrade was far greater than simply changing fuses. The cheap fuse holder, usually about 85 cents retail on most audio units, really degrades the sound even when a upgraded high end audiophile fuse is added. It would be nice if somebody made a pure copper or bronze fuse holder to go with the expensive audio fuses currently on the market but to the best of my knowledge nobody does, what a shame as the fuse holder is the real choke hold.
Johnny
Johnny