KUDOS to Rob at Valvetech. I just got my VAC 22 chassis back from Rob after he did the latest update, and it rocks!!. I loved this little VAC-22 amp before, but the new tweaks from Rob have now made this even better.The older set-up was really nice, but it tended to get a bit gnarly and buzzy at heaviest OD levels. Now the rough edges are smoothed down just a bit and the tone is just slightly rounder. I should also add that I never pulled the chassis before and really looked at Rob's workmanship. He does beautiful work.