Hickok TV-2 'percent quality'

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Hi All,

I'm doing a project for someone, testing a bunch of old tubes. The tester I'm using is a Hickok TV-2A/U. Does anyone know if there is a direct, numerical equivalency between "percent quality" (which is how the TV-2 measures Gm), and micromhos, which is how Gm is usually reported?

Thanks!
 
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