Yes, this is the old "chopper" power supply model from 1974 I have kept
working for years!

Now I need a high voltage block assy. Has the quadrupler as a part of it.
Anyone have any NOS Sony parts around? Or any recommendations?

There were several distributors I used to get Sony parts from, might be
some old companies still around with old parts, but I dont remember who
they were.

Its Part number 1-453-04-631

If I cant find one, im going to retrofit a NTE/ECG quadrupler into the
circuit. Looks like it can be done. The service manual shows the insides.

Thanks in advance community....

Id suggest trying to retrofit the quadrupler. If you find NOS parts its likely going to be expensive. Plus if you document it people could use your method in the future.