I bought a 1979 DR (push boost model) that was modded by running the “boost” from the reverb input, via a pot, to the tone circuit. The vibrato channel went from strangely clean to awful, by adjusting the pot. So I disconnected it and all of a sudden it was so gainy! No headroom at all on the channel. I then put a 12ay7 in V2 and at7 in V4 (reverb recovery?). I now have what is a crazy good gain structure. But the bass is still somewhat flubby at volume. Two questions: how to restrain the bass, and would you fix the high gain “problem” or leave the lower gain tube substitutes? The speaker is a V30. (It may have other mods but haven’t gone through it carefully.) Thanks for any advice/opinions.