tube tester question - Printable Version

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tube tester question - murf - 10-07-2020

Hi fella's,
Have a question about my newest tube tester.
It is a Hickok model 539A.
Has a line adjust control which has a test mark on the voltage meter at 100 volt mark.
When testing tubes, should it be set at the test mark or at 120 volt mark?
murf

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