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(1) Tested 1958 Sylvania 7AG7 Tube Date Code 8-13 Pentode Loctal Vacuum Tube (b)

(1) Tested 1958 Sylvania 7AG7 Tube Date Code 8-13 Pentode Loctal Vacuum Tube (b)

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(1) Tested Sylvania 7AG7 Tube.
Date Code 8-13 (13th week of 1958).

The wording is partially worn but still legible.

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

Gm Test = 2750 micromhos
Minimum pass/good = 1900

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