No-one has mentioned whether it matters which way around you insert your fuses.
No-one has mentioned that your house supply contains other fuses and breakers, most of which are a lot bigger and thicker than those in your audio system. What about them?
What about the fuse for the supply to your turntable? Can this make a difference too.
What about the fuses for the supply to electrostatic speakers?
Do tell us!
This time and money-wasting exercise sure still has a long way to go.