Good points by Mitch2, IMO. Who as he stated has tried SR Red and several other audiophile-oriented fuses, with unimpressive results, and whose audiophile credentials and experience are unimpeachable IMO.
Frank (OP), regarding the comments by Warren Gehl about directionality, which you had cited in this thread on 10-6-2016, I had made the following suggestion in the subsequent post:
If you have an opportunity to speak with Warren on this question again, you might ask him why any such effect is not completely swamped by the randomly oriented grain directions of the vastly longer lengths of wire that are in series with the fuse, that are conducting exactly the same current. Especially in the case of AC mains fuses, where the AC wiring in the component and in the primary winding of its power transformer, and the wiring in the component’s power cord, are all conducting that same current. Not to mention the wiring inside and outside of the house, which are also conducting that current in addition to other currents.
Also, I would again call attention to the comments about fuse directionality that have been presented here by four different designers of well regarded audio electronics, as quoted by me in the first of my posts dated 10-28-2016 near the middle of
this page of the present thread. Which are to the effect that for a fuse to have inherent directional characteristics is impossible. And as a very experienced electronics designer myself, in my case in the defense electronics field, I agree. And furthermore, as quoted in that post, one of those designers (Atmasphere) has explained why a fuse may **appear** to have inherent directional characteristics, but that he has experimentally found that the same audible and measurable effect can be accomplished by simply rotating the fuse in its holder.
It is certainly true that technical understanding and analysis can neither explain nor predict a lot about what we hear or don’t hear from our systems. And in fact I have said on many occasions here that from a technical standpoint there are many things that by their very nature are inherently unpredictable. But technical understanding and analysis can explain and predict some things with certainty. Including the impossibility of fuses having inherent directional characteristics, IMO and that of the aforementioned designers. If people hear differences when the direction of a fuse is reversed, something other than inherent directionality is responsible.
Regards,
-- Al
