[trinescope]

I got the horizontal oscillator back to normal, also I think I have the color sync improved over what it was before. Both sections had flaky mica capacitors, the kind with the 6 color dots that normally don't give too much trouble. They tested OK on an LCR meter, but I'm guessing they didn't hold up with significant DC voltage across them. One was the 100pF capacitor across the variable cap in the horizontal oscillator, the others were the two 3900pF coupling caps from the burst transformer (hue control) to the 6AL5 phase detector.

Although the CRT seems to have good emission, I think it was a bit marginal in construction since I can't get good purity at the edges no matter what I do. The yoke ends up diagonal when purity is as good as I can get it, and that's how it was mounted originally before I took the chassis apart. I also seem unable to get the convergence right at the edges of the screen, probably for the same reason. I'm starting to believe that perfect is going to be the enemy of good here.

The color also looks better without the oversaturated red I had before. I did the matrix adjustments in the service data using a signal generator, so they are just a close approximation to using an actual color bar generator. Using color bars from a DVD the waveforms look reasonable, but for example checking the red video signal shows the yellow bar lower in amplitude than the red and magenta bars. I found similar results on the blue and green video signals as well. I think it's more likely the DVD video signal isn't providing an actual calibrated color bar pattern. It was a JPEG image I got from the web and is a pretty good approximation, but I have no way to know it's exact short of using a vectorscope and waveform monitor on the DVD player output which I don't have at this time.

Next thing is I'm going to run the chassis a bit each day or so to see how it holds up and start working on the cabinet which needs a lot of help. Also need to find a solution for the missing knobs.