And a warning for anyone reading this, I won’t respond to negative comments. All are free to post/read, but keep in mind that the people who have 9,000-12,000 posts in their history are not likely to add anything constructive to this conversation.
If anything at all, it’s not constructive what you claim ac mains fuses can do to music, because there's no backing of any technical proof posted, it just your hearsay.
No manufacturers or even well regarded technicians are willing to come onto these forums and back with their own posts what is claimed to be heard here.
And this is why you don’t have to pay $$$ for a 50cent fuse, for it to make a difference.
To those "non technical" members that are interested, listen to the techs of this industry that designed the very audio products you are listening to.
Just clean and tighten your fuse holder and re-new your fuse (if old) with a good quality 50cent Bussman, Littlefuse or similar.
As with "many switch-on surges" they do deteriorate, bend, stretch and get crusty with electrolysis formations on their fusible wire elements before they give out, as these pics show of a fuse wire element ageing over time show. https://ibb.co/9NbTwqK
(even the $$$ boutique ones will age just as much also)
Cheers George