I really like when specific examples are given like this, and I kind of asked for this a few times in one of the Dirt threads as I'm a Noob for those variances in O/D, Fuzz, etc.Way back at the beginning of this thread I posted some videos of some bass players I thought had great tone. Jimmy Johnson, bass player for James Taylor comes to mind. Tiran Porter of the Doobies (now John Cowan...who I also love). Whoever plays the bass on the track "Tin Man" by America....ooooh wee..that bass sounds fire! "Imaginary Lover" by Atlanta Rhythm Secton...Paul Goddard's tone is spot on! Deep, fat, warm and it sits right in the mix where it needs too.
For the warmth thing, a couple come to mind, which surprise me somewhat because they are both J Basses and not Precisions like I would expect.