This is the ruggedized Mil Spec version of the black plate 6SN7GT with reinforced rods, dual getters and triple mica spacers making for very robust sonics.
Date Code 743.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 2500-2250 micromhos
Minimum pass/good = 1650-1650
Further tested under real operating conditions on a Class A amplifier and exhibiting no microphonics.
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