My new Kortek has been running fine since I installed it in my Ms. Pac running the original Ms.Pac board.
What I do remember was that the picture was really bad because the levels were set too high from the factury. A little adjusting of the pots on the control board and the HVT was all that it took to get it perfect.
I found a source in the far-east that still sells CRT monitors based on a wei-yah chassis and Chungwa CRT.