Quote:
Originally Posted by etype2
The picture will be small on the 21FB due to the different deflection angle of the yoke but the picture should be there. Mike is not sure how the different deflection angle is going to affect the angle of incidence through the aperture plate and on to the phosphors. It might not work at all. IF there is enough magnetism in the static convergence magnets of the 21FB, then the beams will bend where they need to in order to do the job since all we really care about is "rough" convergence for now. . It will be a fun experiment to say the least.
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Deflection angle should only change scan size. The guns will still hit their intended phosphors (provided purity was/is set right). The phosphors are deposited using 3 photographic silk screens...Each photo is made by placing a light source where a gun is supposed to be (one is done for each gun position/phosphor color) and shining the light through the shadow mask (deltagun CRTs don't use no stinkin aperture plate! Patooey
). Thus the mask holes make the phosphor dots. The gun position light source hits the mask at every angle the yoke deflection should be capable of...Granted post deflection like a magnetized shadow mask, or pre-deflection like a mis-adjusted purtiy/static convergence magnet set up can drag the beam places the light source couldn't readily be...
Part of the reason the purity rings exist (besides the big ol celestial magnet we all live on) is to deal with manufacturing tolerance. After phosphering the screen the shadow mask had to be put back on the screen within a certain fraction of the place it was when the silk screen pictures were taken, that has to be mounted up to the bell of the CRT and the gun has to be placed within a certain tolerance from where the light source was...Every one of those placements had tolerance, and without the compensation of purity rings (or magnet) that tolerance would probably have been too tight to manufacture......When you think about it color CRT tech was somewhat of a miraculous achievement with the technology of the day.