Vampire Slayer is an all-tube buffer based on the Effectrode Glass A. It runs a single 12AU7 tube and offers a high input impedance, low output impedance, and wide frequency response. It does an excellent job of adding some extra tube warmth after any solid-state effect, or in the FX loop of a solid state amplifier to get some post-preamp tube warmth before you hit the power amp.
It can take a 9V or 12V input, and can accept center negative or center positive inputs. It uses internal regulators to send 200V to the tube plates, giving it the richness you expect from a full high-voltage preamp. It comes in a 1590B enclosure.
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. Warm up numbers have not been recorded, but after warm-up the preamp pulls 240mA from a 12V supply or 210mA from a 9V supply.