An air-cooled 50-watt transmitting tube with 4-pin metal shell base, ceramic insulator, and rugged plate. Light, rectangular anode. GE and old RCA logos stamped on envelope. Base stamped: "Radiotron / ...
Marked: "RCA Radiola 18 / Reg. U.S. Pat. Off. / See License Notice on Bottom." Specimen is a six tube (plus rectifier) TRF receiver employing the following tube complement: 1st RF: UX226; 2nd RF: ...
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