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OK an update. Twitch is gone. Reflowed all of the solder joints and I must have had a cold joint or joints somewhere. Horizontal frequency is good. The problem remaining is lack of horizontal lock. Vertical is rock solid but the best I can do with the horizontal is a very tenuous steady picture that starts to roll after about 4-5 seconds. Even when it's stable, it's not really stable. I can see it moving just a bit before it loses it. I don't know if this means anything but any sort of movement of the focus (not worried about focus...using the electrostatic 5" test tube) or contrast and brightness throws the horizontal off. The horizontal hold is more or less in the middle but once it loses lock it's very bad. I still couldn't attempt anything like the horizontal adjustments in the service data as they require a semi-stable picture. So it has to be an issue in this Synchro-lock circuit I guess. Any ideas other than some of the ones mentioned before? Should I check voltages on these horizontal circuit tubes???
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