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 ...
Kenotron tube, made by Westinghouse Lamp Co. for RCA. A 4-pin base with ceramic insulator, tipped S-shaped envelope. Stamped on envelope: old RCA logo and WL Co Westinghouse logo. On base: "Kenotron / ...
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