Synergistic Orange fuse was nothing short of unbelievable.
According to Atmasphere, the fuse makes a measurable difference. But Georgehifi thinks that this is not possible.
Don’t twist what he said into something that you want to believe, bad fuse holder contacts (not the fuse) "could" cause a "very slight voltage drop".
Which will be much smaller than the "voltage drop" your fluctuating mains is doing every second anyway, and extremely doubtful you’d hear it, certainly not "was nothing short of unbelievable"
And in the case of any equipment with regulated power supplies it doesn’t even see it, that’s why it’s called "REGULATED"!!