I thought I'd start a thread to see what kind of experiences people have had retubing their supersonics. I've got a 1x12 combo. I put one of the groove tubes 12ax7 mullards in slot 1, it seemed to give the OD channel a harsher and edgier sound. Not sure if I like it yet. I also put an EH 12au7 in slot 2, which works wonders for headroom on the clean channel. Next up: replace the rest of the pre's and put some kt66's in the power section! What kind of luck have all you folks had with retubing so far?