Ah, but gents and ladies, this brings us to the other important question...which cartridge: Shure m-series or Pickering v or Stanton 500
And then, phono pre-amp. Turntable: Ramko or Rec-O-Kut? Penny or dime scotch taped to the tone arm? Mixer...Gates Yard? CCA? RCA? Tubes only? Using a Mackie or Berringer would be sacrilige. Ampex 300 or ReVox A77 to record. Irish Tape?
Look, if you're going to be persnikity down to processor, and mono 45 vs mono LP, THEN feed it over a digital medium, what's the point? And I know Tom has what is argueably the finest Part 15 in America, but really, unless they're listening on a 5 tube All-American, or hopefully a Zenith console tube hi-fi, what's the point? They can't hear your intent.
I enjoy hearing the classic top 40 hits of the 60's, reissued from the original multi-track tapes. They reveal their recording session secrets when played in stereo. Remember, even Buddy Holly, Ahmet Ertugen, The Belmonts, Bobby Vee, Elvis, Neil Sedaka and the Flamingos were huge stereophonic fans. I've heard these songs a zillion times in mono. But when listening to new remastered versions, it's like hearing them for the first time again. I also like color HDTV over B&W analog kinescopes.
But I DO appreciate your purist persuit. It's fun.