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Old-Time Radio

2017-09-10 15:00  
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This circuit was used in the early days of radio to receive signals. Almost any battery-operated triode, such as a type 30,
Old-Time Radio

can be used. `A` battery is 3 V, R2 is a 100- rheostat. Coils are typically 2` to 3` diameter honeycomb wound.

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