April 24, 2024
1x TV7D/U TESTED NOS/NIB UNUSED 1965 GE 7581A / KT66 Tube (6,000 Gm)
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1x (One Tube / Valve ) GE General Electric 7581A KT66 Vacuum TubeDouble sided Flashing with Two Side Halo Getters - Made in U.S.A.Please see all pics, White ink stamped: "7581A KT66" Date coded : "SG" = December 1965 Manufacturers EIA code : "188-05"Condition: Unused, New Old Stock / New in Original BoxCalibrated TV7D/U Testing: ( Tested at ~150v )Tube tested NO Shorts, NO Leakage, NO GasResults: TV7 meter reading of 48/25 where 48 = 6,000 micromhos (Gm) Transconductance ( at 'Bogey' spec) and where a TV7 meter reading of 25 = 3,125 minimum (60-65%) tube life.Spec Reference : GE Engineering Data sheet for a 7581A / KT66 vacuum tube (change dot to a period in the link below) nj7p dot org/Tubes/PDFs/Frank/135-GE/7581A dot pdfThank you for Looking!
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