(1) Tested Delco Type 27 Tube.
Date Code A8.
The tube number is faded on the glass but still legible.
This tube tests as NOS.
Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:
Gm Test = 1050 micromhos
Minimum pass/good = 630
NOS rating = 945
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