An easy fix would be to use an attenuator, ie THD Hotplate etc , to dial in some power tube grind. You would need a 4 Ohm Hotplate with yours. I don't know if you could pull some power tubes to lower the output or not. You could pull a pair of output tubes in a 4 tube amp to achieve that, but this baby has 6 (!) 6L6 's, so I don't know if that trick would work. Hope my limited knowledge could be of some help!