Mike:
here are soime test patterns for color and convergence:
http://bs.cyty.com/menschen/e-etzold...t/testbild.htm
download the JPEGs and burn them on a CD and insert it into a DVD player. With the grid pattern (Gittertestbild) you can adjust convergence and with the red screen-JPEG (Roter Bildschirm...) you can easily adjust purity.
The JPEGs will fit in NTSC too, perhaps you might have a black bar on the left or right side.