I currently have a Mesa Titan V12 head that I am running into a 2x15 Mesa and 4x12 Mesa cab @2 Ohms. Volume is not an issue, it gets stupid loud. My question is what am I am missing, or am I, by not having a tube power section. I had Mesa 400+ and I wasn't really pleased with it, it sounded too clean for my tastes. I like the fact that the Titan gets good growl with the gain control and a great distortion tone through the on-board distortion (tube based I believe). However, I played through a SVT-2 Pro once at a guitar center and it just rocked (as I recall). Unfortunately, that was a) many years ago, and B) long before I had the Mesa Titan, so I have nothing to reference it to, and none to play around Dallas (at least that I have found, other than the SVT-CL at GC). So, before I spend big bucks on a tube head, thought I would put it out here for any advice, opinions, collective wisdom, etc. Thanks!