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(1) Tested International ServiceMaster 14B8 Tube Pentagrid Converter Vacuum Tube

(1) Tested International ServiceMaster 14B8 Tube Pentagrid Converter Vacuum Tube

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$7.95 USD
$7.95 USD
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(1) Tested International ServiceMaster 14B8 Tube.

This tube tests above NOS ratings.

The wording is partially worn off but the branding is still recognizable.

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

Gm Test = 1150-725 micromhos
Minimum pass/good = 630-315
Average NOS rating = 975-475

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