What direction should Hi Fi tune fuse be installed

Geoff, since there is no net flow, no "direction" of electron travel, then it follows there is no difference in the orientation of a fuse. Have someone change it, or not change it, and you have to identify it. You will see you fail as often as you get it right if the sample size is reasonable.

I suppose we'll be told that by virtue of being paid attention to the voodoo and magic won't work.

There is no direction of "AC flow". AC is Alternating Current. There is no net electron flow. All the cable makers, accessory makers, fuse makers, etc., who talk about direction of flow are showing their misunderstanding of the basics of electrical theory.

Geoff, the magnetic wave has no net flow....it oscillates back and forth, not in just one direction. THAT is the definition of AC. You have never taken a physics course, electrical engineering course, have you? Or, you would know better.

Knowing what you don't know is an important thing. You have failed to recognize that which you don't know.

Yes, On Highway 61, I forgot how leading edge the physics is in audio. Nearly all the principles can be learned in freshman year at any of the best engineering universities, so high tech is audio!

Unlike intelligence, which is not much of a personal choice (though IQ can be raised), ignorance is a choice. Google searches bring up texts and university papers in any of the engineering and physics disciplines that relate to audio. But, folks would would rather mouth off and remain stubbornly wrong instead of learn something from those available texts.

"Don't bother me with facts! I have my OPINIONS" seems to be the mantra of so many audio guys (including many "designers" and reviewers).

In racing we used to call this type "bench racers". They talk a big game and it's fun to then see them on the track making fools of themselves. No such accountability in audio, unfortunately.