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(1) Tested Silvertone 22DE4 Tube Date Code 409 EFY Half Wave Rectifier Tube

(1) Tested Silvertone 22DE4 Tube Date Code 409 EFY Half Wave Rectifier Tube

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(1) Tested Silvertone 22DE4 Tube.
Date Code 409 EFY.
The 312 EIA code indicates that this tube was made by Sylvania for Silvertone.

Tested on a calibrated Hickok TV-10 military tube tester with no shorts at 1325 where 800 is minimum pass/good.

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