Well, I guess I will throw in my 2 bits!
I reckon ol' Clint would freeze the Duke with one of his patented stares, and then blow the top of the Dukes head off with a Colt .45 he drew from under the dirtiest poncho (a real poncho, not a Sear's poncho, mind you!), that you ever saw!
As far as tubes vs. solid state, I would say both. (My Lamm M2.1 hybrid monoblocks use the best aspects of both technologies).
As far as Lee Marvin goes, he would be off drunk in some bar, and would miss the gunfight entirely. :-)
