Hi! First of all, I don't know much about these things. All I know is that I wanna have more sound opportunities from my Hartke 3500 head. (And that my english sucks big time ) So I'm thinking about buying a preamp, and drive it trough the effects return on the head. Then I can just turn of the hartke preamp, and it will use the external one instead, right? Anyway, where I live I don't have too many changes to test out different preamps. The local music store doesn't exactly have a own room for bass preamps, to put it that way. So: what preamps would you suggest? They have to be affordable, not much more expensive than 1000 dollars. That is indeed the upper limit. A guy here in Norway is selling a Warwick preamp pretty cheap. Are they any good? Thanks for taking your time!