Lots of great info! Yeah, I'm not all that particular with tubes, I'm in the camp of, if they glow, they're fine 
but I can take some pics and get back with ya!
My Mark III is a green-stripe, Simul-Class by default, short head w/ EQ and reverb, I've yet to get the acronyms straight on the Marks To me it sounds almost just like the Mark VII in IV mode. The Mark VII just sounds a little clearer, with a touch more tightness, but the III definitely has that old Mark sound, where it's just slightly more "angry" sounding compared to the newer Marks
The JP2C, oddly enough, sounds different than the other 2, it's a little more buzzy, but that can be pretty well EQ'd out, it sounds a little less organic than the other 2 Marks, hard to put ny finger on it really. Less dynamic, and very different to dial in, I have to run the presence WAY up compared to the Mark III/VII, otherwise I get a blanket over the speaker effect. The Badlander sounds a lot like the Mark VII in IIC+ mode with the EQ OFF, and the gain set to 12 o'clock, very thin.
