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(1) Tested Sylvania 12AU7A Tube Code GM 12AU7 A Gray Plates Halo Vacuum Tube

(1) Tested Sylvania 12AU7A Tube Code GM 12AU7 A Gray Plates Halo Vacuum Tube

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(1) Tested Sylvania 12AU7A Tube.
Date Code GM.

Gray plates with a top halo O ring getter.

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 = 2650-2600 micromhos
Minimum pass/good = 1400-1400
NOS Target Value = 2100-2100

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