(1) Tested Very Strong Tung Sol USN-CTL-6SN7WGTA Mil Spec Tube.
Date Code 5717 (located on the top).
Tall bottle envelope with a horseshoe halo getter, black plates and sawtooth mica spacers.
The brown base has areas of scratching along with an area of scratched abrasion - see photos. While this may be physically detracting, it does not affect the performance in anyway.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 3000-3125 micromhos
Minimum pass/good = 1650-1650
Also performance tested in-circuit through a Class A amplifier with no microphonics detected.
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