and it worked. I had been moving away from my Fender J, nice as it is, because I wasn't getting the punch I wanted through my Genz Benz gear, much as I love it. I decided to sub in a LM II amp for my Shuttle 6.0 tonight, and run the Jazz through an EBS ValveDrive tube preamp before it hit the amp. From there to a Genz Benz Neox 12, which is the largest cab I can fit into this particular bar gig. Problem solved, although how much was the ValveDrive and how much the LM II, is something I will need to experiment with. But the result was a slightly dirty but very loud, warm and punchy tone. More booty shaking tonight than usual for our band.