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Classic Currents

(1) Tested 1957 Sylvania 7B8 Tube Code 7-13 Loctal Tube Pentagrid Converter Tube

(1) Tested 1957 Sylvania 7B8 Tube Code 7-13 Loctal Tube Pentagrid Converter Tube

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$8.95 USD
$8.95 USD
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(1) Tested Sylvania 7B8 Tube.
Date Code 7-13 (13th week of 1957).

The wording is partially worn but still legible.

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

Gm Test = 1475-800 micromhos
Minimum pass/good = 950-410

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