Reply 20 of 22, by SVD
Thank you for the good explanation, I will try to stick to the original part-numbers then, maybe 54 series instead of 74. If I find any optoisolator chips I might as well just change them. I am a bit afraid of any adjustment work needed after changing a lot of components in this monitor tough. There is a serious amount of potentiometers in this thing. a quick count amounts to 22 pots.
I am committed to fix this screen, I just got a NOS CRT tube for 100USD, shipping and customs will probably end up at more. But I dont think I will find one easily later.