The Horizontal problem was solved with the new 6SN7 in the horizontal oscillator. Lesson learned and I think I'll start with tube replacement in an offending circuit from now on when a problem rears it's head. Always go for the low hanging fruit first
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Since the chassis was out on the bench I decided to give it an upgrade with a new CRT, and elected to try a 10FP4 in the set even though it's not OEM spec. I was hoping for a nice bright image for daytime sports viewing. The 10FP4 definitely doesn't disappoint in the brightness department, and not having to worry about ion-trap placement was a plus. While I was at it I thought I would, with the help of every one here, take the opportunity to learn a bit more about the set and what might be causing different problems.
The photo below shows the set with the new 10FP4 installed. I've highlighted four problem areas. Can any one help identify what the problems are, what may be causing them, and what (if anything) can be done to solve them?
1- Ghosting
2- Vertical Linearity
3- Focus*
4- Horizontal Linearity
*I believe the new CRT is a rebuild as I can detect a neck weld point when the light is just right. The 10BP4 I had installed previously did not have this focus problem, although that may be simply a coincidence.