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I think RCA may have been tops in sales back then but I would hardly say the technical quality was astounding. Now, I really like the styling of RCA's but there were a lot of problems where it seemed they cheaped out on materials on their tube sets leading to burned wiring, flyback failure, etc.
Zenith was more conservatively and solidly built and had more features for ease of service.
Let's not get into the politics of USA/vs. foreign manufacture, that subject is really beyond the scope of this forum.
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