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 / ...
A 4-pin plastic base with getter stain, tipless S-shaped envelope. Stamped on base: "[RCA logo] / Radiotron / -UX-250-"; on top: RCA logo. Molded on press: "30 ...
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