I have a brand new, unopened, Presonus Tubepre I'd like to sell. I bought it online and then ended up not needing it. This is a tube microphone preamp with a real 12AX7 tube inside. It would work really well as a bass preamp and a direct box since it has a balanced XLR output. The "gain" knob controls the volume, while the "drive" knob controls the amount of tube gain. They sell on Ebay and other places for $100, but I'd let it go for $80 shipped (as long as you're in the continental U.S.). Here are some links for information about the unit: Website: Tubepre Harmony-Central: Tubepre I've attached some pictures to show it's unopened and that it would really be the Tubepre in the box. Thanks for looking!