Slampegg Bee Pre X
The Slampegg Bee Pre is based on the preamp of the legendary Ampeg B-15N, though based on input from people that know more about Ampeg than me, more closely related to the B-25.
Controls: Volume, Treble, Bass, Master, Ultra Hi, Bright, Ultra Low
The X Series Slampegg Bee Pre comes stock with a 12AX7 tube, but other 12A*7 tubes can be used for lower gain, and something like a 5751 would be about the right gain level to get in the same ballpark as the 6SL7 like the B-15. It comes in a Hammond 125B enclosure.
It takes a 9-12V input, and can accept center negative or center positive inputs. It uses internal regulators to supply 200V to the plates, giving it the richness you expect from a full high-voltage preamp.
CURRENT DRAW NOTE: Like many Sushi Box pedals, this one uses a tube, which means current draw is a bit higher than a standard pedal. While we haven't profiled X Series yet, you can expect current draw requirements to be ~350mA @ 12v.