I know its a tube preamp and only 150 watts more punchier but, I was wondering if in terms of volume and tone if it was a better amp that the SVT-350/B2R? Here is the thing I can dump 180 in getting my SVT-350/B2R and GK Backline 115 out of the pawn shop. Or I can buy a used SVT-3 Pro for $500 bucks. 500-180 = 320. So I am wondering if it is worth the upgrade for 100 extra watts and a tube pre-amp.