The monitor had two obvious problems at first: yellow tint and rainbow patterning. Quick pass with a degaussing coil took care of the latter. Hooked up a composite lead and threw on my low-quality DVD-R copy of my VHS copy of my NTSC Reference Laserdisc and made some quick adjustments to the monitor; results below:

sharpness sharpness

color bars color bars

To make this post somewhat more relevant to the community:

Xexyz (NES) title screen Xexyz (NES) title screen

Xexyz (NES) in-game Xexyz (NES) in-game

The colors in the game look different in these pictures; hard to make them accurate. But it looks good in person.

Was reaching for my blue filter to set Color/Tint when I remembered this monitor has a “Blue Only” feature; pretty neat! Surprisingly, adjusting the Screen control on the flyback transformer seems to have more effect on the white balance than on the contrast. Still, had to maximize the Blue Gain control on the PCB and on the front panel to get the white balance close as possible for the time being. Heck, I might not actually bother with it much further; it looks pretty good. Will have to try the RGB inputs.