(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.

This tube tests above NOS specs.

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

Test Result = 4125 micromhos

Minimum pass/good = 2500

NOS Target Value = 3750

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