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Tubes for the set showed up last week. New colour burst oscillator seems to have cured problem. Simpsons look great now, tint control is a bit more into the red than I would like to see, but colour is stable and minimal red bleed. CTC17 has a great video about how to dial this out, and at this time I don't have the equipment or experience to do a colour bandpass alignment, but I feel as though I understand the issue a lot better than when I started into this!
Right now am in the process of acquiring an RCA 8PT, and will cut my teeth aligning that before I try it with a colour set. Luckily the Zenith has solid state IF amplifiers, so I didn't throw those out of whack by changing the tubes!
Set has a new problem. Everything is fine with brightness at normal, but when you crank it all the way up, the picture gets larger, and less bright. Why would brightness affect vertical size? Don't remember it doing this before I changed the tubes.
In general though it's back in top shape, have been watching it every day again.
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