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Classic Currents

Tested Matched Pair of 1955 Western Electric 399B Tubes Date Codes 513 Pentodes

Tested Matched Pair of 1955 Western Electric 399B Tubes Date Codes 513 Pentodes

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$34.95 USD
$34.95 USD
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Tested Matched Pair of 1955 Western Electric 399B Tubes.

Each has a date code of 513 which places the production of both to January - March of 1955.
Tubes are closely matched for Gm testing (see below), date codes and internal structure - they are identical.

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

Gm Test = 650 and 625 micromhos
Minimum pass/good = 440

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