In doing some research for the EMCOMMS articles, I ran across this fascinating page at MAKE about home-made electronic components.
I've seen several home-made vacuum tubes, and experimented a lot with various types of crystal detectors, I even made several "Fox Hole Radios" when I was young (see more here), but nothing like this stuff.
H/T to the Retrotechnologist for leading me there.
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Update On The Pioneer SX-780 and Speakers
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WOW! :-)
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