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Question about Hickock 539B tube tester

What is the full scale reading of the Grid Bias voltage meter ?
Thank you,

Comments
Kari
Kari picture
*****

Do you have a Hickok (correct wroten) Tube chart?
Values are between 0--43V usual - so I think FSD can be ie 50V. What states on the scale?
BTW; maybe these help you some... https://elektrotanya.com/hickok_539c_tube_tester_calibration_sm.pdf/down...
Kari
On thes pic you can see on top left a Bias Selector for 10 and 50V wink

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