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what mark said. 1st adjust purity, then converge red on greed, then blue on amber.
for purity: turn down green and blue screens. if your generator has a raster only function use it, otherwise you might need to turn down the AGC for raster only.
Take a look at the red raster. It should be perfectly red. If there are impurities at the center adjust the ring assembly. Spreading the tabs increases field intensity, rotating it changes field direction. You're aiming for best center purity.
If there are impurities around the edges, loosen the deflection yoke and carefully slide it forward and back to obtain best edge purity.
If there is heavy contamination that can not be corrected with this procedure, then the tube may need to be degaussed.
it really helps to have a large mirror in front of the set when doing this.
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Jordan
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