Another intriguing Beatles edited mix…
Recording started towards the end of November 1966; probably with the new smaller vox amps, the 430 and 730, replacing the 7120s which had been used on Revolver. We don’t know the exact date the 30-watt amps arrived; we do know that Lennon took a 7120 head back to his home studio.
Good history here of the S.F.F. evolution/recording process –