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 S-shaped envelope, getter stain, two mesh-type vertical elements, one mounted on either side of stem. Stamped on base: "1207". One label reads: "Concert / Master"; another ...
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