Re: Add a test for microphony to your valve tester
Tektronix used to age valves on an on/off schedule for typically 70 hours. Then check for grid current, and carry out a vibration test.
https://w140.com/tekwiki/images/1/14..._procedure.pdf
From https://w140.com/tekwiki/wiki/Vacuum_tubes
Has all this sort of data.
Craig
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Doomed for a certain term to walk the night
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