[Bill R]

Before you move on to convergance, you have a height and linearity issue to fix. All those blocks should be the same size. It looks like the top ones are compressed. Looks like you have plenty of scan just touch up the vert height and lin controls a bit. To see much effect from the purity rings you would need to pull the yoke back as far as it will go without moving the convergence yoke, then use the purity rings to center the red on the screen. Once it is centered push the yoke up towards the bell of the crt until the red fills the screen and lock it down. Be careful not to turn it left or right. You will know if you did when you look at your crosshatch pattern as the lines would be slanted left or right. Once these things are right do the center static convergence. This will take care of about 80% of the screen and should leave very little dynamic convergence. When you start adjusting the controls on the convergence board find a sams or service manual with the adjustment procedure and follow it to the letter if you haven't done a convergence before. The controls do interact with each other, and you might have to do the entire procedure more than once. If you do not get perfect convergence at the extreme edges don't worry it may not even be noticeable on program material. Take your time, be careful the yoke bites, and have fun. The results will be worth it.

Bill R