Lacee and Zephyr24069,
Yes, the AMR fuse is directional, just as the Synergistic Research and HiFi-Tuning Supreme fuses are.
I just read your post and I'm at work, but I think that it and the other two brands go the other way.
Tbg, in his fuse review said it perfectly. In one direction the fuse sounds perfectly transparent, but when it's reversed, it sounds more full.
Both ways sound good, it's just your personal preference. With my Spectron amp and it's extreme transparency, the direction with the fuller sound works the best for me.
Chuck