Helium-filled full-wave rectifier. A 4-pin base with brass shell and ceramic insulator. Tipped S-shaped envelope. Serial number "5144". Two ceramic-covered cylinders are set side by side on top the ...
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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