Originally Posted by SAM64
at this point the only old fuses I have probably are of the wrong voltage.
Why do you think the voltage is important....you haven't mentioned current, despite the suggestion.
Some fuses are for automotive use and rated at something like 32 volts. Others are for general use and are rated at 250 volts. They will superficially look very similar. Nothing keeps you from mixing and matching them.
If you use a fuse that is rated at too low of a voltage there is some possibility that it will not completely open up when it blows or that it may explode or whatever. In practice none of these things seems to actually happen and it is not unusual to see a low voltage fuse being used on a power line connection.
If one picks up the impression that high end fuses with superior sound quality is a pretty strange concept, then one is perceiving correctly, especially for power line fuses.
Fuses can cause measurable distortion, but this is related to their thermal inertia which is usually pretty much defined by their style and current rating.