I have one of the ampeg SVT billy sheehan preamps for sale. These are discontinued (as is the relationship between Billy and Ampeg) Here is the manual for all of the specifications: http://www.bassemporium.com/pdfs/svpbsp.pdf It is in near perfect condition with no major scratches to speak of. Sounds great! 2 channel blendable overdrive/distortion. $375 OBO shipped CONUS. For outside the US, it will be a bit more for the shipping.