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purity is a must do. Dequass ground the G1s thru 100k reistors (you need 2 one for each G1). Cut off the G and B and see if you get a uniform red raster. If not you will need to do the purity setup. Be careful when sliding the yoke around with the power on. the windings can bite....
Generally if purity is a issue the colors of reg programming will be off depending on the location of the screen (so if you had a green field, some of it will be green with other areas not so much.
If you suspect Green then use the resistors to cut off the R and B guns. You can also just turn down the screen drives, but I like the resistors as I dont like constantly adj the G2 drives.
oh and start out with the G and B G1 drive pots at max, refer to the gray scale setup for the exact procedure.
be aware that adj the convergence and purity interact, so you want the purity set right 1st before spending a lot of time on convergence. You will have to adj things a few times to get the best performance.
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