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Measure voltage on pins 2 and 3.
Do NOT measure pin 7.
Generally a penthouse tube's elements go: heater, cathode, control grid, screen grid, suppressor grid, plate (pin mapping is often random). And if grid is used without screen or suppressor in the sentence then control grid is meant. If you looked at the tubes pinout/datasheet you shouldn't need an explanation of which pin is which. The first datasheet hit on Google has a plenty good explanation.
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