I didn't expect a HiFi tuning fuse to make a difference in my modest system (at the time, running a JoLida 502B). The idea that a short run of very small diameter wire should make a difference seemed silly. But as a $30 tweak, the single one I needed wasn't that much of an expense. Installed, I thought I heard, primarily, a more open soundstage; possibly a bit more detail. When a tube went and took the HiFi fuse, I had to use a Radio Shack fuse until a new HiFi fuse arrived. Going back to a $0.50 R/S fuse convinced me the HiFi Fuse made a difference...without it, something was missing. Things just didn't seem as lively. Compared to the prices for so many other upgrades, the HiFi fuses seem like a bargain.
Experience with high end fuses????
I tried a high buck fuse for power supply in my Exposure 2010s last February it goes in the little tray under the power cord. I was burnt out from comparing things at the time but did switch it out with the stock fuse twice . My gut feeling was the new fuse cleaned things up the image more defined but also made the stage less open and things almost sounded digital and like the top and booom of tan EQ was boosted slightly. I sat down last night and compared and indeed this is the case. As I said the high buck one seems to clean things up but also shrinks the stage and makes the sound almost processed. Has anyone had any real experience with changing fuses?? I guess one would think the manufacture of the amp voiced it with the fuse they wanted in it. keith