Glenn, did you get those isolated 'Sgt. Pepper' tracks that Tim posted? You can here McCartney playing that beautiful Ric bass (pictured above) in all it's hissy, amped (Vox 430 or Vox 730 or blonde Fender Bassman?) glory or D/I (Geoff Emmerick denies using one, but Ken Townsend says McCartney did). Not to mention just plain ol' great bass lines.

Vox 430

Vox 730 (most likely this one)

Fender Bassman with Ric 4001S and Epiphone Casino