Norm,
I know. He was just basing his observation off of the marking on the HiFi-Tuning fuse and assuming that it was there for a reason other than making the fuse look more high-end or snazzy.
I think it's the same marking as the one on the HiFi-Tuning Noise Destroyer, which is a filter. It may just be a company logo thing or it may actually mean something about what it's doing.
I believe that he said that part of the symbol designates a diode and another something else. Can those things be fitted in there?
Chuck