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Classic Currents

(1) Tested 1957 Sylvania 2D21 Tube with Box Date Code 722 Tetrode Thyratron Tube

(1) Tested 1957 Sylvania 2D21 Tube with Box Date Code 722 Tetrode Thyratron Tube

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(1) Tested Sylvania 2D21 Tube with Box.
Date Code 722 (22nd week of 1957).

Tested on a calibrated Hickok TV-10 military tube tester with no shorts at 1025 where 800 is minimum pass/good.

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