The guru on fuses:

Kakyol - thanks!

So, the physics of the fuse is negligible.

Negligible compared to running 240v vs 120v ?

Well I have listened, and have "made" many audiophile friends listen to, on their system, with their boutique fuses, and my generic new ones. Not once, literally not once could they pick out the boutique fuse blind in a power supply circuit. That is 10 people, about 15 tests. How many times do I have to replicate the test to prove the point?

The reality is, though, that I could detect a fuse change with equipment, measuring only at the power supply, at the very limit of continuous power, but would be very difficult, if not impossible to detect at the output, due to the supply filtering, and feedback, either local or overall of the amplifier.

bluemoondriver,

Yes, negligible to voltage as well.

A fuse is a current device. It reacts to the current flow in it. It is not voltage dependent. The only reason they MAY put a voltage rating on it is to make sure that you do not use it in a circuit which may be above its maximum INSULATION voltage, for safety. But its blowing parameter is ALWAYS in Amperes, not volts.

Having said that, a typical device, assuming it can operate with multiple voltages, will usually draw HALF as much current when used with 240 Volts as it does when used with 120 Volts.

So, if you are using .. say a 1200 watt power consuming amplifier, at 120 Volts, it will draw 10 amperes when operating at its maximum volume and will need a 10 amp fuse. When you take this device to the UK for example (assuming it DOES work there and has a voltage selector on it to allow that), the same device will now need only a 5 amp fuse, since it is now connected to 240 Volts.

NONE OF THE ABOVE IN ANY WAY WILL AFFECT THE SOUND. IT IS ALL FOR SAFETY.

Why is this still a thing?