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Agreed with what everyone says. I'm also seeing a intermittent horizontal failure.
I'm suprisied that it has as good of a picture as it does. Usually the electrolytic caps in those early transistor sets are getting pretty leaky and dried out.
The horizontal issue could be a weak solder joint.
You could poke around the horizontal oscillator circuit and look for a change in the picture. (Use a plastic stick pen or something no conductive)
Also how many turns can you turn the horizontal hold control?
Some of these TV's have a control that is a pot (which is the same as a volume control) and if this is dirty and losing connection you would have the collapsing issue also.
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