Well guys, I found the magic. JJ5750 in V1 Original ECC83 tubes in V2 and V3 JJ Gold pin 12AX7 in V4 This is the winner guys. If you are looking for more play with your gain knob, less unwanted distortion, but with no sacrifices anywhere else in this wonderful little beast, that's it. The 5750 gives lower input gain than the original ECC83, which gives more clean headroom, and allows you to play more dynamically. The drawback of this tube choice is that you sacrifice overall volume, and treble. Although... The Gold pin JJ 12AX7 re-ups your gain a little (giving you your volume back) and also adds treble (giving you back your sizzle). Having this at the end of your chain removes (pretty much removes) all the defects of the 5750, and still keeps the benefit of staying cleaner with strong playing. This $40 solution to an other wise glorious amplifier has, so far, been amazing. If you're looking for what I was in this beast, that's it. Just felt like sharing. Stay Funky My Friends.