Kortek color purity question

davemcl

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I have a 19" Kortek monitor with the remote board purchaced from ArcadeShop earlier this year> I got this to put in the Multi-Williams project I've been working on. The colors wash in from the bottom corners. At first I thought it needed to be degaussed, but several tries with a degaussing coil yeilded no noticeable difference.
The next thing I tried was moving the yoke up & moving the yoke magnets around a bit. While this improved the condition slightly, It still is giving me a wash of colors at the bottom corners. I've also tried adjusting the color pots on the neck board & RGB gain pots on the chassis board. Nothing I have done has been able to give me color purity on red green or blue screens. See the pictures below. I have the same condition on the red test screen, I just didn't have picture or that.
Any suggestions?
 

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