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(1) Tested Sylvania 12CU5 12C5 Tube with Box Date Code ef ABF 12CU5 Tube 12C5

(1) Tested Sylvania 12CU5 12C5 Tube with Box Date Code ef ABF 12CU5 Tube 12C5

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(1) Tested Sylvania 12CU5 12C5 Tube with Original Box.
Date Code ef ABF.

Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:

Gm Test = 9000 micromhos
Minimum pass/good = 5650

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