I have no idea Geoff, and I am not questioning the claims of those who say they hear a difference. What I am doing is asking in all seriousness (snarking aside) how it is a fuse can possibly be directional while operating in an AC circuit. It is my (admittedly limited) understanding of Alternating Current that to do so is simply, incontrovertibly impossible. So as Jeff Bridge’s character Bad Blake in Crazy Love implored of his manager, enlighten me (and Ralph Karsten, and anyone else curious about how the well-known, understood, accepted, and time-proven properties of Alternating Current can suddenly be suspended).