I see there is a nice XY lcd project already done, you can see it here, it has a pretty low cost:
and another one here:
it's clear you want to work from the low level XY signals in the cure tracer, not the deflection circuits. virtually nothing else is actually required. these articles may help somebody reach the goal line a bit quicker. for the round CRT 575, I think a CRT adaptation is maybe more appropriate and easier to accomplish.
all the best,
walter
sphere research corp.
