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(1) Tested Zenith 6DS4 Tube with Box Nuvistor Tube Code 218 Sylvania EIA

(1) Tested Zenith 6DS4 Tube with Box Nuvistor Tube Code 218 Sylvania EIA

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$22.95 USD
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(1) Tested Zenith 6DS4 Nuvistor Tube with Original Box.
Date Code 218.
The 312 EIA code indicates that this tube was made by Sylvania for Zenith.

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

Gm Test = 4125 micromhos
Minimum pass/good = 2500

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