I left the original yoke in the set and replace the flyback with an Admiral. That did the trick
Glad I tried that before messing around with the yoke.
I popped in the full sized CRT but couldn't get an image until I tried a PM trap rather than the electromagetic one. I'll have to investigate that further.
After a few minutes of operation, the vertical holds gets very touchy and retrace lines appear. The contrast is pretty touchy too and the sound is poor. Even so it's a big improvement
