WHYY’s arts and culture reporter Peter Crimmins first became interested in radio in the fourth grade, when he smuggled a contraband crystal-diode radio into the Boy Scout summer camp. Subsequent radio ...
He found an assembled Philmore “selective” radio kit. The simple kit had a coil, a germanium diode, and a crystal earphone. We were sad when [Michael] accidentally burned a part of the radio ...
The tube in question is a special vacuum diode designed to be operated in saturation ... and covers most of the frequency bands of interest to radio amateurs. The whole project is built up ...
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