First stereo? Around 1965. It was a 'console' set, that is: a plastic carry box the size of a small briefcase that had a turntable and removable speakers. I remember taking the speakers and strapping them to my ears with a belt to get the loudest sound. It's probably one reasons that my hearing drops off a cliff at about 10k. Well, that and decades of Lynyrd Skynyrd, Yes and Funkytown with Koss Pro4AA headphones.
The Hi Fi Audio Quest: circa late 1950s