1955 Sylvania JAN-CHS-6SN7WGT Brown Base,Chrome Dome, 3 Holes Black Plates Tube

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*Fantastic Tubes 🎷🎶*Domestic U.S.A. shipping only ! Sorry, NO international shipping !One tube, circa 1955, U.S.A made by Sylvania ,type JAN-CHS-6SN7WGT vacuum tubeas pictured .Condition:Appears to be a New Old Stock/NEW tube to me, comes in with white boxSilk-Screening:Please refer to photosSylvania's Acid Etched Designation:6SN7 / WGT / E5BPainted Designation:JAN-CHS-6SN7WGTDate Codes:E5BTube features symmetric black T plates, an extra support rod between mica spacers, brown micanol base and chrome dome getter construction.*Tested on Hickok 539B * for shorts (PASS), gas (PASS) and mutual conductance (Gm).Test Results (Gm)2400/2550minimum recommended for a good tube:1640/1640(Triode#1 / Triode#2)* Hickok 539B is a mutual conductance (Gm) type tube tester. It does check for mutual conductance which is a more accurate measure of tube's age.Satisfaction Guaranteed!*Fantastic Tubes !!!🎷🎶