I know that this pre was made from 87ish til 95 or 96 in cooperation with SWR. Beyond that I don't have much knowledge about it or any experience with it. I have a friend who is also a bass player and I can get this preamp from him for $200 since he has one that he isn't using. I have seen it and he assures me that it is in good condition and has even offered to pay to have it gone over by a local amp tech. Now if these are good and reliable preamps then it could save me some money as I am in the process of upgrading my rig. Any info, links, pictures, etc. would be very much apreciated. Thanks.