I have an old Schecter that was converted to fretless many years ago. I had EMG pups in it before the conversion, and after the fretless conversion I put the originals back in. It is ok.. I have a Sadowsky 4 knob pre from a different bass that I will never play, and im wondering if the original pups (stock early '80s) will sound good with that preamp. I have not been able to find any kind of compatibility info on which pups are good and wich ones are not... They are passive and sound good, just not the modern sound Im looking for. Ive looked for Sadowsky 4 string jazz pups, and they are very hard to find. Barts have so many options I get swamped. Aguilars? Lindy Fralins? Anyone have an opinion?