We. Have. High voltage! There were a few dodgy-looking solder joints around the horizontal oscillator tube socket; I repaired all of them, powered back on, and:
So, it's a looong way from working, but every bit of progress is encouraging.
- There's about 300V of boost, and HV of about 9.5kV.
- The H frequency is way off (way too low), and you can't see very clearly in the photo but the horizontal has a big bright line down the middle. The raster is only about 1cm high, and awfully jiggly.
- Cranking on the CALIBRATE control varies the pitch and intensity of the horiz oscillator, with a tiny bit of change on screen but not much.
At this point it all seems solvable, and it's probably time to start replacing those capacitors and checking resistors. On a whim I checked C30 (it's 390pf in my model) and it's right on the money. I connected a frequency counter to the horiz drive socket and it says 12.925khz. If that is correct, it's not a small amount.