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It's my experience that gassy tubes normally test with excellent emissions (assuming the heater isn't open or about to be open), but on B&K testers where you turn the cutoff up until the meter increases by 2 divisions the cutoff will exhibit "neon bulb" behavior where you get 0 increase then it shoots to the far end of the scale and you can't make it read stable outside of those 2 states. It's distinct enough that I'm confident I can detect an unusably gassy tubes in anything it can test.
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