The EE said that the marking on the HiFi-Tuning fuses indicate that the fuses are filtering in addition to being a fuse. I don't know why he thought that the Furutech also had filtering, and the SR and AMR didn't.
Since he's the head of the plant's engineering department and there's a big construction project going on right now, unfortunately, he's not someone that I can just go see anytime I want.
Chuck