Interesting recent experience of one difference between an old-style fuse box and a new RCD-based consumer unit.They lost me at no fuse in a plug .. if you have a new consumer box with RCDs (or use an rcd device) at your risk you can try a large bolt to fill the fuse holder.
You will need at least three, one copper, one silver and one gold and then let your ears decide which is the best sounding. If something shorts on the house circuit or there is a massive electrical surge perhaps you can pray that your amp has fuse protection built in (lots do). This means for the experiment to be meaningful all internal fuses in the equipment need to be hard wired too (again three types of wire; copper, silver and gold).
If you do not have an RCD fuse box of course the limitations are still there with the fuse wire in the distribution box. If you do have RCDs perhaps the suppliers will then start making them with precious metals (as that is bound to make them sound better according to the proponents of gold and silver wires and fuses)
Or if you remain in your senses you will leave well alone and stay safe and not worry that a fuse might be having any detrimental affect on the amplifier or other pieces of electrical equipment ..
Perhaps Wammers who have changed from a fuse box to an RCD one can report on changes to sound quality by taking one fuse out of the chain (it made bugger all difference to my system).
I must be getting very old to have even read the original posting let alone comment on it
When our consortium bought the pub 5 miles from here, we had a rubbish BT broadband connection and no WiFi coverage to speak of, so as a temporary measure while we figured out how to wire it up properly, I installed a couple of TP-Link powerline kits and we replaced BT with Starlink. All worker just fine for a few months, despite the fact that the powerline devices were connected to at least two, possibly 3, separate ring mains. Then we had the main old-style fuse box ripped out and replaced with one fitted with RCBOs - individual breakers, each with its own residual current trip, for each circuit. Immediately the reliability of the powerline kit went through the floor, sometimes working at low speeds, sometimes failing if particular appliances such as the washing machine were running at the time. As all of our point of sale kit relies on the powerline kit to provide a data connection, the only solution was to install a proper hard wired Ethernet backbone net with WiFi access points.
Nothing to do with SQ of course, but could be of interest to anyone planning to use powerline kit to avoid having to lay Ethernet cables - if you have a modern consumer unit and you need the powerline kit to span multiple circuits it may give you problems.