I'll see what I can do as far a layout. I'm thinking for the switching, why wouldn't having something like a looper with a cable to each preamp work. You could control which preamp is in the circuit? I think they make ones that when to turn on one switch it would turn off the other, so you can only have 1 switch on at a time.
I figured if give a lite insight into the amp design and tube swap. I don't think it's going to sound more American with the tube switch, but he's going to change the amount of headroom in the amp and the tone will be a little different. I know people have done it before, but the el34 has less headroom then the 6L6's, which makes a direct switch a little harder then going in the opposite direction. I only know about this in my new obsession with designing amps, and when looking at the sunn 2000s, yes the layout will be posted soon, it's designed with 6550's, but it can run kt88's for more headroom no problem, and believe it or not you could put in el34's, and 6L6's without having a readjust the bias. The output of the amp will have less output and breakup much sooner as a result. Also, I believe the tube socket would need to be altered to allow for the pinout of the new tubes to work. It's adding a jumper between two of the unused pins.
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