Myles, I play through a Fender pro-tube Twin Amp that I absolutely love, but the high-gain channel is a little bit hot for my purposes. I play mostly blues, jazz, and rock in jazz combos and my church worship team. I enjoy heavy metal and like the heavy gain, but setting the gain on 2 is clean and 3.5-4 is fully saturated. I would like to have more colors of gain and when I turn around to adjust quickly from one sound to the other (like a bluesy drive to a slightly thickened rhythm or to a rock lead), I don't like having to just barely touch the gain knob, so as to not have a Metallica sound going in the middle of a worship service (somehow the older members of the church don't appreciate metal). I know the tubes in that amp are fairly hot, and I have considered putting in a 5751 tube in the first position. I believe both channels share the same first stage, but I'll have to check the schematics for that. What would be your recommendation to cool the gain and add a little more definition to the gain channel?