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(1) Tested Ken Rad 6SH7 Tube Date Code 6-39 6SH7 Sharp Cutoff Pentode Tube

(1) Tested Ken Rad 6SH7 Tube Date Code 6-39 6SH7 Sharp Cutoff Pentode Tube

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(1) Tested Ken-Rad 6SH7 Tube.
Date Code 239.
The 188 EIA code indicates that this tube was made by GE for Ken-Rad.

Minor spots of paint loss along the top lip.

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

Gm Test = 2850 micromhos
Minimum pass/good = 2150

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