The guru on fuses:

Applying some science from another discipline might be interesting.
If orange or red fuses were described by users as adding brightness or detail, and if blue fuses were described as adding smoothness and “tubey” qualities, then this would add to the arguments of those who shout ‘placebo’ and call for double blind testing. Because sugar pills those colours cause patients to perceive these effects on their senses according to colour. On the other hand, if these effects are not reported, or are reversed, this is evidence for the ‘trust your ears’ community.
Or is the colour effect the other way around...? Ah! The double bluff!
Take a card; take any card. Don’t show me the card, show it to the audience .. look into my eyes, not around the eyes, look into the eyes...

Could someone who knows electrical engineering (I am just about competent enough to change a fuse but that is my limit) help me understand the difference alternative fuses could make relative to the difference running 240v vs 120v through that same circuit?  To my poor level of understanding, it would seem to me that the fundamentals of doubling voltage / halving current through a circuit ought to have a bigger effect than 1cm of a different conducting material in that circuit.  Yet most equipment we use has a simple 240/120v switch around the back. Won’t flipping that switch drown whatever effect the fuse in the circuit might have?

Kakyol - thanks!

So, the physics of the fuse is negligible.

Negligible compared to running 240v vs 120v ?