It was my brother-in-law. He was 10 years older than I and he was the coolest guy to me. I never had a brother, only a sister but, she was cool because she married Richard. He was audio repair tech at the local Radio Shack repair depot. This was the early 70's.
He would lend me stereo components, not just the Realistic brand stuff, everything. I was the only 15yr old in the neighborhood who had a different stereo component every other month. Not always new but, refurb'ed and working well! Marantz, Nakamichi, B&O, Tandberg I was in heaven and I didn't know it at the time! I couldn't keep the stuff but, a few weeks with pieces was very cool knowing something new was always coming.
Because of Richard, my brother-in-law, I got in to electronics early, got my Ham license at 16 went to school for Electronics and EE and shortly moved into chip level repair of PDP-11's and comp. terminals in the late 70s. (Long story short)
I still have a great love for audio gear. He would have loved working on the Dynacos with me. He gave me a ST120. My Brother-in-law died in a car accident almost 30 yrs ago now but, when I listen to a nice system or, work on a piece of gear, I can't help feeling that he's right there with me, with a big smile on his face! God I miss him.