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not always. I always use the red gun to index the purity. unless there's a defect in the shadow mask of the tube (it happens) you should be able to get good purity.
If you get a perfect red raster and there are no tube defects, then the rest of the colors should also be perfect. Make sure you have no magnetic influence near the CRT. This can be speakers, wall warts (power supplies) transformers --basically anything else that can generate a magnetic field.
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Jordan
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