I have a tweed that can take 6L6's without rebiasing. Right now I have 1 JJ 12ax7 and 1 GT Mullard RI 12ax7. I have a JJ GZ34 Rectifier, and two JJ 6V6's. I'm looking for some 12aXX7 suggestions, a 5Y3 suggestion, and some 6L6's. Doesn't have to NOS. Current production is fine. The amp gets pretty dirty pretty quickly. Looking for something that will maybe open it up a little.