Questions on convergence...

In gnneral there are 2 types of convergece adjustments : Static convergence, which affects the whole screen (and which you tweak to get the 3 colours lined up in the middle of the screen) and dynamic convergence, which affects the edges and corners only. IIRC, these terms come from the old delta-gun CRTs (the 3 electron guns are at the corners of an equilateral triangle, like a capital delta). On those tubes, static convergence was done with permanent magents (hence steady, or staitc fields), while dynamic convergence was done by passing carefully controlled currnts through coils around the CRT neck (hence changing, or dynamic fields). Your CRT is later than that, and has the 3 guns in a straight horizontal line. With those, static convergernce is normally done by sets of ring magnets on the back of the yoke, dynamic convergence by tilting the yoke slightly (and wedging it with rubber blocks). On some high-end monitors there are still dyanamic convergence circuits feeding assorted coils, though. Personally, I'd not want to try to do the convergence on a monitor without the service manual. If you're mot that easily put off, try displaying a cross-hatch pattern (a little matter of programming on a computer moniotor), then mark the ring magnets on the back of the yoke so you can get them back to the original position if you make things a lot worse, then try fiddling with them. You will quickly get frustrated when you find the beams do not go where you expect. When you've got the centre correct, you can try tilting the yoke to sort out the edges and corners. The main problem is that you ahve to do this with the monitor on, and there can be high-ish voltages (hundreds of volts) on the yoke windings and connections. Take great care, have somebody nearby who knows how to turn off the power, and so on. -tony