[dtvmcdonald]

The only replacement part in the set appeared to be a red 0.1 uF cap in the vertical, replacing a paper wrapped one. It was hooked to the wrong spot. It also measured about 10K resistance. The other 0.1 cap next to it measured 35 megohms and was left in as its going to be replaced. Installing a new 0.1 made the vertical work. The red cap was only a 200 volt one: the manual lists the voltage as just below that ... but it has AC peaks far above 200 volts, so no wonder it failed.

The sync circuit looked odd. It eventually turns out that this is an "old" chassis except sync which is "new". It was wired OK.

I then tried to get a signal generator through the IF. It went through
IF3 OK, but IF two was dead. This took a while to fix as it had three problems: The tube had a grid-screen short. The "contrast" (cathode resistor for the first two IF stages) control was bad. The bypass cap for the screen was about 5Kohms. The first IF and mixer were OK.

I tried feeding RF from an RF sweep generator. This showed that the three channels were 2,3,4 and all worked. The IF response is abysmally bad. I fed a real signal in and it produced nothing until i wiggled the channel switch. Deoxit fixed that.
I then got obvious slope-detected audio at the detector. Adjusting the oscillator trimmer fixed that and I got video nice and clear (on a scope ... no CRT and no HV at the moment.) There was no video at the feed for the CRT. This was a dead short screen bypass cap. I'm surprised that had been no sign of magic smoke.
Fixing that gave good video. I have not tried to see if sync works yet.

Edit: vertical sync seems to work "well enough" to use. Horizontal doesn't. If the output stage 6SN7
is removed it can be made to sync, poorly. Something's wrong.