Tube,
All I can say for now is it is Class A/B discrete (pardon the spelling of that one), all electronic balanced. What is unique is the Tube drive. It is not in the gain stages anywhere, so you can use the tube without adding gain. Most units have the tube in the output stages, so in order to push the tube, you have to overdrive the output. That leaves you with distorted shit and crap sound.
This unit is a true blend. The drive only blends in the tube distortion so you can add warmth, or filth, but not effect gain...it is really cool. We will release more specifics later, but we looked at the Burr Brown op amps, and there was no real difference, so to keep it at $249.99 list, my guess $199.99 street, we went a different direction, but all we be told in time.