BOY SCOUT CRYSTAL RADIO UPGRADE
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Crystal Radio--Hi Q Hoop Coil--Copper vs Litz (4K)
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Mike Peebles "PO-1956" Amplified Crystal Set
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My New Favorite! Crystal Radio with Antenna Tuner
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Understanding and Building Crystal Radio Sets
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How to Design a Coil for Specific Inductance
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Super Crystal Radio Set
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Crystal Radio, Capacitive Tuning (Update with Annotations Available!)
15:22