The earliest records I remember owning were "The Monkees" and "More of the Monkees," which were hand-me-downs from my older brothers. Those two albums totally got me hooked on music and records, and on the day I was given them, I played them over and over and over. This would have been around 1969 or '70, when I was about 6. Within two years I owned most of the Monkees' Colgems albums and 45s, which were still in print. I still love the Monkees BTW!
I also remember owning the 45 of "Joy To The World" by Three Dog Night (all the kids in 2nd grade had that 45) and the Partridge Family "Sound Magazine" LP.
In those days I played my records on either a green plastic mono portable record player or on the big RCA Victor TV-radio-phono console in the living room.