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The tube circuitry is really pretty amazing in its simplicity for the most part...like in a Portacolor TV, you can take just 12 tubes or so and have a complete color TV...you'd have to have so many discrete transistors to do the same thing.
I do find that the modern circuitry though is inherently very reliable and requires less maintenance...wish the soldering, circuit boards, heat sinks, etc. were better, though.
While I love the old sets, I think that their quality could have been improved upon for better reliability. The rca flyback failures, cases of burned circuit boards and wiring in many brands, heat-related intermittants, and so forth could have been much improved by a little bit more robust engineering and quality control.
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