Referring to your response : 12:19pm #162991
I agree with you, 1st step would be
to get at the 576 CRT display XYZ info & possibly a sync pulse out to the back panel to go to a different X-Y scope, monitor or a CRT replacement. The CRT & HV xfmr deaths are the primary headaches !
If you have further details or insight, please continue to bring it up !