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(1) Tested Truetone 6AT8 Tube with Box Code 530 Triode Pentode Converter Tube

(1) Tested Truetone 6AT8 Tube with Box Code 530 Triode Pentode Converter Tube

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(1) Tested Truetone 6AT8 Tube with Original Box.
Date Code 530.
The 274 EIA indicates that this tube was made by RCA for Truetone.

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

Gm Test = 5125-5750 micromhos
Minimum pass/good = 2900-2840

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