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I wonder why more was not done to improve the tube type color sets. I know about the problems as we used an RCA CTC-39 for 10 hrs or more a day when I was in high school. Bad solder joints, horizontal output tubes burned out etc. Parents had to buy new TV's when I moved out as the "TV technician" (ME) was not there to take care of the sets anymore. They do take a LOT more maintenance that solid states when they are used a lot. RCA seemed to be the worst with heat destruction of parts. The Zenith hand wired chassis seemed to be the best with regards to heat related problems.
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