My interest has been even earlier, late 60's- early 70's- Island UK, Vertigo UK (recently discovered with a vengeance), Harvest (label, not the record mentioned next), as well as 'standard issue' stuff that just sounded good on first pressings, e.g. Neil Young's Harvest mastered by Lee Hulko, etc.
As the studio equipment got more complicated, and artists and engineers got more traction with multi-tracking, the sound got worse- partly because stuff was miked separately, indeed recorded separately, rather than a 'natural acoustic' of an actual performance, stuff got overdubbed, or punched in later. All of this took 'air' out of the balloon- some of the later stuff just sounds very 'flat' to my ears. Maybe it is euphony that I like, I'm wary of arguments about 'accuracy.' And some really dumb records sound just great- e.g. standard issue A & M Carpenters Single compilation on vinyl.