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(1) Tested Truetone 6BK7A Tube with Box Code 5743 6BK7 A Twin Triode Tube

(1) Tested Truetone 6BK7A Tube with Box Code 5743 6BK7 A Twin Triode Tube

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(1) Tested Truetone 6BK7A Tube with Original Box.
Date Code 5743.
The 274 EIA code indicates that this tube was made by RCA for Truetone/Western Auto.

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

Gm Test = 7500-9875 micromhos
Minimum pass/good = 5350-5350

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