PS. VH Audio carries the HifiTuning Supreme Cu (at a friendly price). As of this writing, The Cable Company and most other parts suppliers, do not. I have no skin in the game, just a satisfied customer...
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the Hi-Fi Tuning "Cu" fuse is a gold-plated copper fuse. It would impart a full/warm type of sound with rolled off highs. Generally, this fuse is much better than most stock fuses, unless the amp/preamp is voiced so much on the warm side (like Marantz, McIntosh, etc.). And yes, it's only made in the small 5x20 model. If you want a similar type of sound but need a large 6.3x32mm fuse, try an Isoclean. It's made in a very similar way (gold-plated copper elements), but it's likely the Hi-Fi Tuning has superior metals.
I’m not saying that it sounds bad. I’m just saying that when compared to other fuses, the gold-plated copper will give a warmth of sound with rolled off highs. It could be that the components in your system are working very well with with this Cu fuse. If you put in a Hi-Fi Tuning Supreme fuse, which is 99% silver, then the sound will definitely be much different (could be too fast/bright and you’d lose the organic feel). Same with other fuses, they all have a different sonic influence in the sound.
A pause to the paean, or "Can't stand the paean": If the material in your fuse, i.e. copper or silver or gold or voltage bombarded cryoed spinach stems seems to cause a change in the overall sound of the system, you’re imagination is running wild and, although that state of mind may be fun, it disregards the power supply’s filtering, rectification either tube or SS, and the component’s various wires and other bits assembled with zero regard for wire directionality or the claims of fuse sales persons. Warmth of sound...man...warmth of brain more likely, perhaps caused by your hat.