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In the 80s and 90s, I was a pure Sony snob, and I bought only their top-of-the-line sets. From 1989-1995, I had a Sony XBR Pro 25-inch monitor with separate tuner that displayed an amazing picture from Laser Discs and was quite good with broadcast signals as well (and cable on the channels that had good signals). So, I do not know much about other brands or lower-end Sony sets in those years.
To evaluate a set of that era now, you should set the color control to minimum (so it looks black-and-white), and watch the overall tint of its picture when first turned on, and also compare the overall tint and sharpness with the contrast very low versus very high. If it is anything other than proper shades of gray during these tests (other than in the first ten seconds or so when first turned on), or if it gets blurry with high contrast compared to low, then the CRT is quite possibly weak. (Very small amounts of off-tint can be adjusted out with internal service controls, though.)
You will need to use a digital-TV tuner "converter box" or a cable box with TV channel-3 output to test any sets of that era, if you care about the RF input; many Sony sets had problems with their tuners in that period.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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