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Borden Radio
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Regenerative receiver radio tube armstrong triode schematic fet coil detector vacuum techy tuesday ago years antenna radioboard forums rich threeHow i built a shortwave armstrong fet regenerative receiver Adding a small speaker to a borden or armstrong one or two tube radio.
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Armstrong One-Tube Radio Kit Borden Radio Company; Houston,
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Borden Radio
Adding a small speaker to a Borden or Armstrong one or two tube radio
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One Tube Radio
How I built a shortwave Armstrong FET regenerative receiver