A plastic 4-pin base with tipped S-shaped envelope. Donor's card reads: "Full wave rectifier made by the Eveready Raytheon Company about 1929. A gaseous type rectifier without filament or heater, an ...
A plastic 4-pin base with tipless domed envelope. Stamped on envelope: "83". Donor’s card reads: “Full-wave mercury vapor rectifier made by the Radio Corporation of America about 1935 or before.
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