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(1) Tested 1955 Sylvania 12SA7GT Tube Date 518 12SA7 GT Converter Vacuum Tube

(1) Tested 1955 Sylvania 12SA7GT Tube Date 518 12SA7 GT Converter Vacuum Tube

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(1) Tested Sylvania 12SA7GT Tube.
Date Code 518 (18th week of 1955).

This tube tests well above NOS ratings.

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

Gm Test = 800-850 micromhos
Minimum pass/good = 470-470
Average NOS rating = 705-705

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