Mark,
Thank you for the pointers. I will investigate them all. I was able to get the HV up to -1600 V for a few minutes, which was just long enough to verify that the replacement CRT was working and undamaged. I got to that point by cleaning R1427 with IPA, so it may well be that there is surface contamination providing leakage paths in the HV section. I don¡¯t want to jump to any conclusions, however, since the problem has not been remotely solved.
The investigation may take a while because I¡¯ve got other, more pressing issues that require the bench. I¡¯m happy, however, to have addressed one of the big problems with this scope (the CRT damage) though I guess I just replaced it with the HV fault.
¡ª Jeff Dutky
