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Back in the 70s I had a Motorola with a round tube, I don't remember which tube, that had the same problem. I could see in the neck that the heater for the green gun was not lighted. I found that if I tapped on the neck of the tube, the connection would make and as long as the set was on, it worked. The set was of the transformerless type, with series heater string, and had a heater transformer only for the picture tube. I wired the heater transformer ahead of the off-on switch so the tube heater would be energized all the time. The fix worked for well over a year until I found a better tv in someone's trash, a Setchel-Carlson, and got rid of the Motorola. The only issue with it was anytime that the power went out, or the tv got unplugged, I had to take off the back and tap the neck of the tube.
Now of course I wish that I had kept both of those tvs.
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