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(1) Tested 1952 Sylvania 6SA7 Tube with Box Code 252 Pentagrid Converter Tube

(1) Tested 1952 Sylvania 6SA7 Tube with Box Code 252 Pentagrid Converter Tube

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(1) Tested Sylvania 6SA7 Tube with Original Box.
Date Code 252 (52nd week of 1952).

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

Gm Test = 950-975 micromhos
Minimum pass/good = 470-470

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