I have an early model SWR SM400-S from the mid-90s (pre-CBS I assume) that I've been pleased with and I do not consider the tone "shrill" or "sterile" as some have described (I do admit that I don't try a lot of gear so maybe I'm just used to the tone). Lately, however, I've been considering going to a modular setup with a new model Demeter VTBP-201s as the preamp. So, in determining whether or not it's worth the extra cash outlay, are there any owners of both amps who can describe the tonal differences I can expect between the two? Night and day? Slight variations? I may not have a chance to A/B them so any help would be appreciated. I play active and passive basses listed below... Thanks!