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 50-watt transmitting tube with 4-pin brass base, ceramic insulator, shield around stem. Light, rectangular anode. Tipped, T-shaped envelope. Marked on base: "Radiotron / Model UV203 / [GE logo] 50 ...
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