http://www.aguilaramp.com/html/products/db680.html My all-time favorite tube preamp for bass. Aesthetically the amp is near perfect, and it has just returned from the shop, where they replaced a transformer (I think) and gave the whole unit and the tubes a clean bill of health. I'm only selling because my power amp broke down, and I just bought a new double bass. Instead of a new power amp, I'm going to give the solid-state Aguilar amps a try. If I had a few more bucks, I would never sell this. I may buy another one someday. US$1200 + shipping.