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Best 1U rack tube preamp

Demeter HBP-1 is very nice, especially the Jensen transformer version if you require such for recording, etc. Not as fat & tubey as you might suspect, but a very interesting and flexible EQ section and good effects loop (with send/receive level controls) make it a contender.
 
It's always tricky when you start talking about "tube warmth". Does the OP mean a bit of subtle tube compression, a touch of tube "grind", a swampy, early John Paul Jones tone, or ???

In my brief period with an F-1X, I didn't find it particularly warm or tubey. My vote would be for the Demeter or the Aguilar.
 
I like the Alembic F-1x for its ooomph ratio. I wouldn't describe it as fatty tubey because that description makes me think of flabby, but instead I'd call it rich, full, and strong -- everything just jumps out very alive. Just my two cents.

Mark