Came to me as a parts chassis.
It's missing
R92
Remote board
FB
IC 1,2,3,and 4
50/60 pot was wrong value
I added all these and got full deflection and then the jitters, then a slow and full collapse.
After not finding anything and the IC3 was getting 25 volts on pin 5 and 8 think I thought maybe it's a bad IC3. It wasn't new so it might be bad. It was. Replaced it and now I have full deflection.