(1) Tested Delco 6V6GT Tube.
Date Code 813.
The 312 EIA number indicates that this tube was made by Sylvania for Delco.
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 = 3850 micromhos
Minimum pass/good = 2320
NOS rating = 3480
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