(1) Tested RCA Cunningham Type 41 Engraved Base Tube.
Date Code J3 (stamped on the bottom of base).
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 1925 micromhos
Minimum pass/good = 1000
~ Please view all 5 photos ~
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✯ Testing ✯
Our tube testers are calibrated on an annual basis in order to provide the most accurate results possible. We prefer the versatility and precision of Hickok TV-10 military testers and use them almost exclusively except in rare instances when pinout/socket compatibility is not possible.
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