1952 Two-Tube Regen

1952OctPM1952OctPM2Seventy years ago, this gentleman is pulling in the short waves, or possibly a station on the standard broadcast band, with this two-tube regenerative receiver. It was ideal for those interested in becoming hams, or just for those who wanted to listen to foreign broadcasts, hams, or just local broadcasts.

A 12SL7 was used as regenerative detector, with the other half of the tube serving as audio amplifier. This was fed to a 50L6 which served as final AF amplifier to drive a loudspeaker. A selenium rectifier rounded out the active devices, allowing operation on household current. The tube filaments were in series with a dropping resistor and could run directly off the household current. For best results, a 75-100 foot outdoor antenna was recommended, but stronger stations could be picked up with 20-40 feet of wire indoors.

Plans for the set were found in the October 1952 issue of Popular Mechanics.

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