I've been searching the forums here, but haven't been able to come up with a detailed explanation of what the differences are between the Ampeg SVT (Vintage or CL), SVTII and SVTII Pro heads. I was wondering if you guys would mind giving me some insight on this. My main interest is tonal and volume differences, reliability differences, features and options, etc. I've heard that the SVTII Pro is basically a CL with extras. Is this accurate? And where does the SVT II fit into the mix? Thanks!