Adjusting fuses for directionality, although very likely a complete waste of time since fuses are a part of an alternating electricity flow (AC), could reveal a .000137% difference in something or other that you're not going to be able to notice unless you fool yourself into thinking you do…it's a fuse…a tiny, output irrelevant wire not actually in the signal path, and designed to melt. Don't be fooled by the unexplainable mythology of snake oil purveyors unless hey, you enjoy faith based tweaking…in which case, geoffkait is your man! (and, he claims to not use fuses except in the metaphorical sense of his "having a short fuse" as illustrated in his re-posting everything he sees fit to comment on).