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I recall one particular evening when Ralph and I decided to wire a small amplifier to a speaker on a tube radio that we had in our basement. We were curious. My parents were upstairs getting ready for a wedding. Well.....we turn that sucker on and the lights all over the house are blinking off and on. My dad yells out.......what the he!! are you two doing down there ? My buddy's laying on the floor laughing his butt off cause everytime I try to turn the sucker off, I'm getting zapped......just like we used to when you were standing on a cement floor and touched an iron that wasn't grounded properly. In my haste to turn it off, it took me a few times to remember to just UNPLUG it !
About ten yrs. back, I built a crystal radio for my youngest daughter's science project in gradeschool. I had told her about the ones I used to build when I was a kid. She wanted to emulate that. She still has it tucked away for nostalgic sake. Those were the best of times George. 
) rockets that never got off the ground. We'd use the thin coil wire from an old speaker as an ignition source. Simply hooked it up to an old car battery with a throw switch. It'd glow red and ignite the powder. Many an anthill saw their last days out in the fields where we used to play. Little bombs made from copper tubing. It's a wonder we didn't kill ourselves, in all honesty. I'll never forget the day that a weather balloon landed in our backyard on the same date that an early Apollo mission returned to earth. I watched this thing come down for a good five minutes and was convinced that it was a piece of the Apollo rocket.
Incidentally, it originated from the U.S. As to what part, I simply can't recall. It'd sure be nice to have as a history keepsake though.
I'll put one together shortly.....maybe this afternoon. It's raining here anyways.