I first got hooked on this hobby in the late 1950's. I remember an uncle playing the 1812 Overture on his Ampex 612 open reel tape player (it did not record) through McIntosh MC-30 power amplifiers into Jensen Triaxial speakers in Carlson (sp?) enclosures. I thought this was incredible. My uncle later got a Sony preamp and power amp and an early pair of Bose 901 speakers. Back in this days, those Bose 901 were considered to be first class. My voice teacher at Indiana University, who would later sing at the Metropolitan Opera, also had Bose 901s. Of course, he thought you pronounced them "booze". They were powered by an AR amplifier and fed by an AR turntable and Revox A77 tape deck. To many, his previous equipment, that included Quad ESL-57 electrostatic speakers and Leak electronics and later a Tandberg 64 tape deck, was in a different class. Unfortunately they were stolen from his apartment.
As for me, my first real piece of high fidelity was a Sony TC-260 tape deck my father bought me as I headed off to college in 1965. Since then I've had numerous amplifiers, including the Dynaco SCA-35 mentioned, receivers from HH Scott, Marantz, Pioneer, Sony, Denon, Onkyo and Yamaha, open reel tape decks, cassette tape decks, Hi-Fi VCRs, laserdisc players, turntables, cartridges, speakers, DVD players, Blu-Ray players, 4K Blu-Ray, etc. I still use the Hi-Fi VCR to record our local symphony broadcasts that I dub to CD.
One other comment. I remember at one time subscribing to Audio, High Fidelity, Stereo Review, Video, Video Review and Home Theater magazines. The amazing thing is that I found time to read them all and still get a life. Now, after mergers and failures, only Sound and Vision remains.
It's been a great 55 years of hobby and as I tell my wife, it's still less expensive than collecting cars. Being a musician in this hobby is a curse. You know exactly what music should should like from creating it yourself and experiencing it in the flesh. The hobby is an impossible dream. That being said, I'm looking forward to getting a new receiver with HDMI 2.1. And who knows what else.
BTW, if you are not familiar, you can find information on just about anything at Hi-Fi Engine
https://www.hifiengine.com and it's companion Vinyl Engine
https://www.vinylengine.com/