From Analog Planet, this detailed article: The Beatles Get Back To Mono and AAA Vinyl
Unfortunately, these albums will not be exacty the same as the originally-released MONO LPs. It would be impossible to do that given the age of the master tapes and the newer equipment used produce these pressings...It’s important to remember that the tapes have aged—some as much as fifty years—and the monitoring, playback and mastering equipment have changed as well, even though the work was done in the very same room in which the originals were mastered. Solid state has replaced tubes in the cutting chain.
The extensive listening and final post production work was accomplished by Abbey Road’s GRAMMY® Award winning engineer Sean Magee and GRAMMY® Award winning mastering supervisor Steve Berkowitz. Working from the original production notes, they have re-mixed the albums to produce the best-sounding MONO LPs possible. They will be on the heavy vinyl we remember from the 1960s and packaged similarly too. But for purists, these will not be recreations of the original LPs but renderings close enough for the majority of us.
They'll be expensive too. Amazon already has the collection available for pre-order: The Beatles in Mono Vinyl Box Set (Limited Edition)
Over the years prior to the CD release of The Beatles catalog in 1987, I purchased a few original UK MONO LPs. Most important, to me, are the Rubber Soul and Sgt. Pepper's MONO LPs. My first pressing Rubber Soul LP is a -1 matrix "Loud Cut" album. The backing instrumentals are a bit louder and more aggressive than the later pressings which soon followed. I think that LP rocks!
But I'm glad I also have a copy of pressing which followed.
And as I've mentioned elsewhere on this board, one of my "prized poseessions" is a mint first UK MONO pressing of Sgt. Pepper's. It's an experience to listen to! The MONO CD Remaster comes close. I hope the new MONO LP will come even closer.
Those two LPs are very expensive today. So is the original MONO UK The Beatles album. As the article mentions...When I interviewed Ken Scott, he told me that Paul wanted the stereo mix of The Beatles to be as different as possible from the mono because that might induce fans to buy both. The mono mix came first. And the two mixes are very different. You could say the stereo mix was more about commerce than art. If you grew up listening to the stereo mix, the mono will be an ear opener.
It's still possible to get original UK MONO LPs in excellent condition for reasonable amounts. For those who want something very close to the original, this box set is perfect. It's important to have a quality turntable, stylus and system to fully appreciate these LPs.