hmm.. funny... I just got this exact same question through AllExperts.
Like I said, you really need to duplicate the equipment if you want to be accurate. There's an excellent book available that details all the recording sessions along with pics so you can see mic placement etc..
Along with that, grab some of the UltraRare CD's with the outtakes on them.
Alternatively, go to usenet and look in the the alt.sounds.mp3.beatles newsgroup... they're constantly being posted there.
When you hear the raw outtakes, you can see how much processing was used on the final product too. You'll also have a hard time duplicating the reverb with modern equipment.