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Classic Currents

(1) Tested 1971 Western Electric 407A Tube Date Code 7152 407 A Double Triode

(1) Tested 1971 Western Electric 407A Tube Date Code 7152 407 A Double Triode

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(1) Tested 1971 Western Electric 407A Tube.

Date Code 7152 which places the production of this tube to October - December of 1971.

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

Gm Test = 4125-4000 micromhos
Minimum pass/good = 3300-3300

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