Response from Jonathan: Troy,

Yes, this issue could be a tube problem or an adjustment issue. It could also be related to some other things as well including bad parts on your monitor chassis, grounding issues, etc. We recommend starting off with the adjustments to see if it helps your issue. Start off by adjusting the horizontal and vertical hold potentiometers (or pots) on the monitor chassis. You might also see if you can find the horizontal/vertical sync or frequency pots as well as adjusting these could also help with your issue. Check out our post on Adjusting An Arcade Monitor for more information. Please let us know if the problem continues after adjusting the monitor and we’ll try to help you out further with your issue. Feel free to send pictures as that will help us better diagnose the problem.

Hope that helps. Thank you for your question and good luck with your repair.