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(1) Tested 1960 Sylvania 12BH7A Tube and Box Code GB VLS Gray Plates Twin Triode

(1) Tested 1960 Sylvania 12BH7A Tube and Box Code GB VLS Gray Plates Twin Triode

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$34.95 USD
$34.95 USD
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(1) Tested Very Strong Sylvania 12BH7A Tube with Original Box.
Date Code GB VLS (February of 1960).

The back tab of the box has been taped closed - see photo 4.

Gray Plates with a top square halo getter.

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

Gm Test = 3400-3950 micromhos
Minimum pass/good = 1500-1500

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