If you're hearing things that only exist in your head, I'm pretty sure the DSM has a diagnosis for that. Like it or not, we can measure damn near anything.
But I'll say it again...
If your amp is effected by a fuse, your amp truly sucks. If the power supply cannot soak up such a minor variance among the much more measurable perturbations, it's simply not doing its job and is extremely poorly designed. If you want to know why high end amps don't come packaged with snake oil, that's why. They believe in the ability of their design to be immune to such insignificant things.
But I'll say it again...
If your amp is effected by a fuse, your amp truly sucks. If the power supply cannot soak up such a minor variance among the much more measurable perturbations, it's simply not doing its job and is extremely poorly designed. If you want to know why high end amps don't come packaged with snake oil, that's why. They believe in the ability of their design to be immune to such insignificant things.