(1) Tested Living Sounds Audio (LSA) 6SN7 Tube.
Date Code T022.
Bottom/side solid round foil getter and gray T plates.
This tube tests above NOS specs.
Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:
Test Result = 2750-2650
Minimum pass/good = 1650-1650
NOS Target Value = 2475-2475
Also performance tested in-circuit through a Class A amplifier with no microphonics detected.
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