Some of you might have answered my "to be or not to be" amp question between a Mesa Boogie 400+ and an Ampeg SVT 4Pro. I'm loving the Mesa , but something is bothering me. The Ampeg SVT 4Pro is supposed to be one of the most powerful amps out there, but this all-tube 400+ can match its volume even though its wattage is rated at about a quarter of what the Ampeg is. I'm playing with a rock drummer/beater, a guitar player whos rig consists of a Line 6 Vetta II 300 watt amp and a Mesa Boogie full stack. I'm pumping this 400+ through an Ampeg 4x10 pro (600 watts @ 8 ohms) and an ampeg 1x15 classic that I put a Carvin 15" speaker in (600watts @8 ohms). I know manufactures can be somewhat "liberal" in thier power ratings, but how do Tube watts and Solid-State watts compare? I thought a watt was a watt!