I have the older 400(came with 6 6550's instead of 12 6L6's) and it sounds like heaven..gets a much meaner grind than an Ampeg..
Ampegs have a low-mid growl when pushed, but the Mesa'a have this gritty top-end when they overdrive..it's a little harsher than the SVT, and much more articulate to my ears
Paul D'Amour used a Mesa Bass 400 to record his 4001CS on a small Tool album known by the name of "Undertow"..


