Yay, the oscillator is oscillating again.
I replaced three mica caps and a couple more resistors in the horizontal AFC/osc circuit and my favorite waveform is back. Also HV (25KV) and a screen image. Two of those micas (C106, C110) were rated for 1KV, so I tend to point the finger at them, although I have no way to test a 1KV cap.
Which puts me back where I was a week ago, wanting to see some color in those dratted color bars. Before messing with color, though I'm going to behave responsibly for a change, and work through the procedures for HV adjustment and HV performance check. The manual says that involves measuring current at the 6BK4 regulator cathode as well as at the HV fuse.
Interestingly, when I put on a color bar pattern, I saw some rippling waves of color, rather than monochrome bars, and the Color and Hue controls actually had some effect on the image -- the first time ever.
That gives me hope of solving the color issue eventually. But first I need to do the HV adjustments and some other voltage checks, so I can play the set for more than 60 seconds without fearing a meltdown.
Thx again for the advice.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html