Classic Currents
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(1) Tested 1971 Western Electric 407A Tube.
Date Code 7113 which places the production of this tube to January - March of 1971.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 4000-3875 micromhos
Minimum pass/good = 3300-3300
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