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(1) Tested Deforest Sanabria 6CB6A Tube Code 239 Pentode 6CB6 A Vacuum Tube

(1) Tested Deforest Sanabria 6CB6A Tube Code 239 Pentode 6CB6 A Vacuum Tube

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(1) Tested Deforest Sanabria 6CB6A Tube.
Date Code 239.
The 312 EIA code indicates that this tube was made by Sylvania.

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

Test Result = 4500 micromhos
Minimum pass/good = 3500

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