There is a small area of permanent light silver colored dusting on the interior of the glass that does not move - see photo 4). Obviously this doesn't affect performance.
Tested on a calibrated Hickok TV-10 military tube tester withno shortsandno leakswith the following results:
Gm Test = 3000-2750 micromhos
Minimum pass/good = 1650-1650
Average NOS rating = 2500-2500
Also performance tested in-circuit through a Class A amplifier with no microphonics detected.
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