A 4-pin brass base shell with ceramic insulator, tipped S-shaped envelope. Stamped on envelope: old style RCA logo, GE logo; on base: "Radiotron / model UV-201 / Patented / Licensed for Amateur / or ...
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 / ...
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