Well Alembic refers to it on their site as F-1X and that's what's silkscreened on the front. But I could be wrong.
Just thought I'd mention that and say F-1X a couple more times so anyone doing a search for "F-1X" will find this thread.
This is a killer pre, BTW. The Ampeg I'm running now is deep and tube-like and everything, but nothing like this!
Somebody please remove this temptation!