You get a stunning copy of the early Beatles sound using a tube amp and the 325 v 64 Miami.
Best to try to emulate some less complex George songs, since these were usually recorded in a rush with little effort by Lennon/McCartney to fiddle unnecessarily with the sound.
Just strumming the opening chords to "Do You Want To Know a Secret" with all the dials at 12 o'clock will make your hair stand on end, it's that creepily accurate. The short scale of the guitar, thicker strings, third pick-up and the normal resonance created by the tube amp all combine to create THE sound.
Take your baseline from there.
Same set-up and other Ric's (330 and 650) are almost the same, but not quite. Playing though solid state amp (Vox ADV50 or Fender practice amp) sounds unfinished and less full.