Nice to see the insides of the mysterious black box!
Peter, I presume that was you who put the schematic on the inside?
Your photos are better than the tiny ones on the Alembic main website (hint, hint). Alembic should scan the nice F1X/F2B/SF2 brochure from a few years back and put it on their site.
Interesting tube shields - are they stock from the factory? I have heard the black IEC finned style - used by the US military - is good for heat transfer and shielding.
Nice, neat wiring, and the transformer is well away from the signal path.
Now how much of a handicap is it to have the power switch on the rear, rather than on the front where you can reach it while rackmounted?
EffClef