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The good news is that once purity and convergence are set, you do not have to adjust it anymore. Unless you make a major move with the set, and even then it will be minimal, and you will have no problem making the adjustment. Even if a componant fails, once you replace it convergence will only need touch up. The real fun comes when you have to replace the crt. Then you get to take all those componants off the neck of the old tube and reinstall them on the new one. That is when all those adjustments get really out of whack, because the tube is different and the componants are located in slightly different positions. That is why the labor was so high on a color picture tube replacement, and a lot of people just bought new sets and junked their old one.
Bill R
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