yes, that is your tube number... fairly useless when troubleshooting a monitor
Take some pictures of the chassis (the monitor PCB) as that can give us a better idea. I know the atomiswave sit-down drivers use WG D9200 monitors, so I wouldn't be surprised if the upright is similar.
As nem said. try adjusting the voltage on the Flyback first... if the voltage is too low the picture will be dim, if it's too high you'll usually get diagonal white lines crawling the screen.
What I usually do is:
1. turn the brightness all the way up, and the contrast all the way down,
2. adjust the voltage on the flyback up until you start seeing the white lines, then once you see them turn it back down until they disappear again.
3. adjust the brightness/contrast as needed.
If you're paranoid about getting zapped by your monitor they do make plastic/wood adjustment tools (basically just long wood or plastic screwdrivers). or just wear some rubber gloves
