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It's a relative emissions test. He's comparing the red gun to the green and blue guns. In a color tube the absolute ability of a gun to emit electrons is meaningless. All three guns must be emitting electrons, and they must have abilities that are fairly close to one another, otherwise correct tracking becomes an impossibility. Just the fact that the red gun is weaker by some factor of four to six is enough: the gun is weak.
Now if all Doug cared about was say producing a uniform red raster, then an absolute test of emissions would be in order. A red gun four to six times weaker than the other two should still produce a uniform field of red. That said, Doug isn't likely to be watching any programming like that, almost all content is a mixture of all three primaries, and thus the relative strength of the three guns becomes the limit on usability.
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