Bob,
Like rashaki, my dad had all kinds of test equipment, heathkit amps tuners, preamps, etc. lying around and liked to show me various things on the oscilloscope while he was testing them, and when I asked if I could build one for myself, he was all for it. I had to scrounge around for tubes, tube sockets, capacitors, etc., and one day when he was at work and I was a little bored, I went down to the basement and saw this ancient 1950s black and white TV sitting there, long dead, and decided that would be a great place to start collecting parts... and the first thing I did was to pull the thick red wire off the picture tube, and then handled the end part with the suction cup sort of thing on it and... blammo! I found myself on my ass with a ddazed and confused look on my face. I turned the TV set around to where it had been and went back upstairs and pretended nothing had happened.
The next time my dad and I went to the basement, he said, how about we get some parts out of this old TV for your project, and there's something I want to show you too. He turned the set around and said, I see you already discovered what I wanted to tell you about, and smiled a little.

I was probably about 7 or 8 at the time, and then our next project was to build me a soldering iron -- which we did, completely from scratch with one of the many transformers lying around, and a pair of tips/heating elements he had lying around. That soldering iron continued to work until I was past college, and I'll bet my dad still uses it.
DIY audio has been with me ever since.
-- Jim