Sgt Pepper, believe it or not, was recorded on Abbey Road's Studer J37 4-track recorders.
A couple of years later, in time for the White Album, it seems Abbey Rd had acquired some 8-track recorders. The story's a bit confused, but either the EMI technical dept., whose word was law, had witheld consent for anyone to use the 8-track until some modifications had been made. That, or George Martin, unknown to the band, had been offered one for the Beatle's use but after discussing it with the studio turned it down on the grounds he thought the band wouldn't be happy with it.
The Beatles pounced on one anyway while Martin was away and tried using it despite the technical dept. ruling they were not to be used in the studios yet.
It seems that one of the modifications EMI had identified the new recorder as needing was to add a separate sync amp, without which the Artifical Double Tracking ("flanging") that was characteristic of the later Beatle's work wasn't possible.
So The White Album was done in the end using a mix of 4 and 8 track desks, tracking through an EMI REDD console with a grand total of 8 inputs and 4 output busses.
And we think DAWs can be hard work....