Oregonpapa's forum is closed so I am contributing here. In my system, the SR blue fuses and outlets sound warm and inviting. I tried an SR orange fuse and found it to be more open, possibly more dynamic but stuck with the blue. The black fuse and outlet have a grainy sound, less dynamic, clear and warm compared to the blue. So, skipping the orange, the purple is touted as superior (in all ways?) to the orange. That would be a great accomplishment at $199.
The other complaint concerning the black fuse is that it took literally 72 hours prior to sounding listenable/good. The blue fuses sounded superior from the time I stuck it in compared to 1000+ hours on black fuses. I hope that the purple fuses sound better as soon as they are installed and not suffer through 50 to 100 hours prior to sounding great. I just don't have the patience and don't like wasting tubes.
