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(1) Tested Zenith 6BQ6GTB 6CU6 Tube with Box Code 2-09 6BQ6 GTB Tube 6CU6 Tube

(1) Tested Zenith 6BQ6GTB 6CU6 Tube with Box Code 2-09 6BQ6 GTB Tube 6CU6 Tube

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(1) Tested Rad-Tel 6BQ6GTB/6CU6 Tube with Original Box.
Date Code 2-09.
The 312 EIA code indicates that this tube was made by Sylvania for Zenith.

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

Gm Test = 4825 micromhos
Minimum pass/good = 2800

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