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A lot of testers made in the color era (post 1953) have their emissions scale calibrated for color CRTs. Color CRTs have a shadow mask between the gun and phosphor that absorbs %80 of the gun emissions preventing that much from reaching the screen. Color tubesthus need a LOT more emission for a given screen brightness. I've tested a lot of tubes with my tester and kind of know where in the bad zone a monochrome tube is really going to be bad at, and where in the bad zone it should work OK.
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