I'm heading towards moving up from my SVT-lllPro to all tube power and am looking at the Ampeg SVT-llPro/Classic/Vintage. The Classic and Vintage appear to be the same except for the cosmetics. The llPro has a couple of extra 12AX7's, graphic EQ and is a rack mountable. Do they all sound about the same? Does one stand out above the others in tone?