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(1) Tested Truetone 6BK7B Tube with Box Date Code 6213 6BK7 B Twin Triode (b)

(1) Tested Truetone 6BK7B Tube with Box Date Code 6213 6BK7 B Twin Triode (b)

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$11.95 USD
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(1) Tested Truetone 6BK7B Tube with Original Box.
Date Code 6213.
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 = 10,750-9125 micromhos
Minimum pass/good = 5350-5350

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