Determining current flow to install "audiophile" fuses.

I don't think there is any fuse that doesn't have a direction that is best. Even when Syn. Res. zapped their fuses both directions on direction always sounded best. Why if there are real scientist here can they not explain why. The nonsense that it is AC current going through them is obviously wrong. 

Stop being engineers, real scientists would be finding out why there is a direction. If you don't bother, I will not be surprised, but I really don't care. It is everyone loss if you don't switch your main  fuse on your preamp and listen to it both ways.

Hi-Fi Tuning used to claim no directional difference, but I tried 10 of them and they were all the same direction. The same with the original SR fuses. Even cheap fuses are directional. I suspect the place to look is in how the fuses are made.

The nonsense that it is AC current going through them is obviously wrong.

tbg, are you suggesting that fuses don't have AC current going through them?

Just a FWIW for you: real engineers have to by definition also be scientists. If we abandoned the scientific principle it would be impossible to design and build anything.

" Stop being engineers, real scientists would be finding out why there is a direction".

No dude, there's no science at all -- math is savvy and sufficient enough to conclude and judge. Forget the math, just use trivial elementary school arithmetic -- of course if you're savvy enough to do that.

Adding/Subtracting 5-digit arbitrary numbers without using calculator AND/OR paper-pen trains memory and logic.

When smart people seemingly speak before thinking there is often some agenda at play.

Stop being engineers, real scientists would be finding out why there is a direction.

Well Geoff is supposedly a theoretical physicist and gave an explanation until someone comes up with something better.

There is supposedly this thing called math involved that can be used to communicate how theory works to the engineers that will actually make something useful. Like Einstein did to communicate his theories to those who eventually ended up making the bomb. Theoretical physics sounds cool but not an excuse to just make things up and sell them as real or meaningful. I’ll just put my trust in the good EEs current understanding especially having already wasted time trying to hear a difference.

Meanwhile its the engineers that take the best accepted "theories" and actually make things that work. So just take that for what’s it’s worth all. Like Atmasphere said (paraphrasing) "no good engineering without good science to support it".