A 4-pin plastic base with top cap, domed envelope. Stamped on base: “CBS / Made in U.S.A.” Donor’s card reads: “Half-wave mercury vapor rectifier made by CBS-Hytron. Used in the power supply of radio ...
Plastic 4-pin base, top contact, S-shaped envelope. Donor’s card reads: “Half-wave mercury vapor rectifier made by Westinghouse for the US government during World War II. This tube is the Westinghouse ...
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