True, there's only a preamp valve in my abm 500 and it's not the best sounding when pushed, one day i'll have an svt... I'll have a look into both of them and see, just want extra grit on top of slamming my pedalsPowerstage. If you are going for a tube amp sound, why wouldn't just get a pedal that pushes a tube?
AU-Drive is another option but way too expensive for what it is. When I saw the schematic, I was less than thrilled with the amount I paid