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For the most part, you can measure resistors in circuit in a tube set (with the power disconnected!) and get readings pretty close to what you'd get out of circuit. In any event, in circuit would make for lower than true readings, but not higher resistance than what it really is. High resistance resistors like 470K and higher tend to go way high when bad. I had 470K resistors go to 870K. Which didn't help in a triode audio driver circuit. Replaced it and that circuit worked again.
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