A 2-pin plastic base with top contact, S-shaped envelope. Donor’s card reads: “Half-wave, thermionic, mercury-vapor rectifier made by Western Electric Company. Oxide coated filament, 2.5 volts at 3 ...
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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