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(1) Tested Silvertone 12BY7A Tube Date Code 69-39 Sharp Cutoff Pentode 12BY7 A

(1) Tested Silvertone 12BY7A Tube Date Code 69-39 Sharp Cutoff Pentode 12BY7 A

Made by RCA.

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(1) Tested Silvertone 12BY7A Tube.
Date Code 69-39.
The 274 EIA code indicates that this tube was made by RCA for Silvertone.

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

Gm Test = 7500 micromhos
Minimum pass/good = 5700

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