We Need A Separate Forum for Fuses

In my Rogue Cronus Magnum Ii, SR fuses in the tube circuit make a very noticeable improvement in SQ. Stands to reason because the entire audio signal, at very low level, passes through each fuse. An extremely thin wire that is meant to melt under excess load is probably not well suited to passing 10 octaves of delicate music signal without altering phase or amplitude for some frequencies.
An audio circuit bears no resemblance to an appliance where the main purpose is to generate random heat energy, of course.

Geoffkait,
I guess I don’t understand your comments. The fuses are there to protect the circuit in case of component failure, not to protect against the low level music signal. The effect on the music signal is an unintended consequence - which could be large or small dependind on the circuit and fuse design.
At any rate, in my system I hear a definite improvement by “upgrading” the fuses through which the audio signal flows. Replacing the main power fuse does not seem to improve the sound.