Testing 6J1 6AK5 EF95 vacuum tubes on a Hickok 539B tube tester 

This video shows testing of 6J1 and 6AK5 vacuum tubes on a vintage Hickok 539B tube tester. A typical quality test of vacuum tubes includes shorts/leakage, gas, and mutual conductance testing. The Hickok models 539B and 539C testers are considered among the best of the vintage Hickok tube testers that were produced.
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