Quote:
Originally Posted by old_tv_nut
The way to think about metal cone mono CRTs is to note the effects of degaussing metal cone color CRTs. Degaussing the color CRT results in beam landing deviations on the order of fractions of a millimeter (the spacing between color dots). It does not produce any noticeable change in the geometry of the image. So, in a monochrome metal cone tube, it would produce no noticeable effect and is not needed.
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Beam landing POSITION errors in a shadow mask tube, if small, don't cause purity problems. The problem with them is that magnetic fields result in landing ANGLE errors, which send the beam to the wrong place after the mask.
I too would expect that the usual minor magnetic fields in a metal cone
B&W tube would not result in problems with ordinary program material.
For high resolution specialty monitors, that might be very different. That has
already been mentioned.