Update!
Yes, it's been a while! I sort of put this project on the back burner for a bit, but this weekend I jumped back into it. Ah, well, I figure this set had been sitting inactive for quite a while anyway before I got it, so a few more months won't hurt.
First off, got the horizontal oscillator problem fixed-- it was C602 which goes across the sine coil. It tested okay earlier, but I decided to replace it anyway, and that was it! Yayyyy!
I also decided to just go and re-cap most of the HV section, after C115 "blew" during a test run (this cap couples the 800V B+ boost line with the "horiz tuning" coil in the damper circuit). I'm one of those who tends to avoid blindly replacing caps, but I figure this will save some potential future headaches.
['Sides, if I had just gone and re-capped the horiz osc circuit in the first place, I wouldn't have had this problem for so long! Of course, at least now I know exactly what component was bad, and I learned something in the meantime, so I guess it's a trade off...]
Next I need to tackle the chroma section, which may be interesting, since I haven't had any experience with chroma issues. As you can see in some of the attached images, it
was making color for a while [though the color phase or something was way off-- as you can also see, the colors are 'mixed-up', and there was no setting of the hue control that would fully correct them. Also, the fine tuning had to be mistuned (note the noise bands) to get any color]. Unfortunately, it suddenly seemed to "lose" the R-Y channel shortly thereafter. I poked around a bit, and repaired and re-dressed two wires that for some reason had long ago been wedged between the power resistors on the 'riser' card and the adjacent color amp tubes, which had caused the wires to char. However, after replacing the chassis and switching the set on, I find that now there's no chroma at all.
I get a passable B&W image (though with poor purity and convergence, since I haven't done anything with that yet), but no color. Adjusting the color killer does not even bring in color 'noise', so there's definitely no color signal getting through.
Any ideas? BTW, one thing I noticed that I thought was odd-- the colorburst crystal in this set is mounted in a glass tube (like a 7-pin minature tube envelope) hidden under a metal shield. I wonder why they didn't use a regular metal-can-mounted crystal in these sets?
Another thing I need to do is clean the tuner. The station selector is *very* touchy at best, and some channel positions don't seem to work at all. I think I'm going to have to completely disassemble the tuner though-- I did try a little tuner cleaner spray in the openings near the switch wafers hoping I could just 'short-cut' this job, but this had little to no effect. Is there any particular "trick" to this?