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 ...
Aluminum base shell with ceramic insulator, 4 short pins, top contact, T-shaped envelope. Stamped on envelope: "371B". Donor’s card reads: “Half-wave rectifier made by National Union for the US ...
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