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Andy, You brought up a bad memory.... LOL! Years ago, I had a 23" Zenith System 3 and the picture tube did go bad. I had the tube replaced but I remember how pricey it was because it was a 23". I have seen some of the tri-focus tubes go bad but NEVER those delta's. And Andy, you are right, put one of those Zenith Chromacolor tubes in an older set and you will see a VAST improvement! My Uncle would use Chromacolor tubes once in awhile for replacements, but they were pricey! He must have gotten a deal on Sylvania "new guns" because we used those most often. They produced a great picture as well. I even remember the last roundie tube we installed. A Sylvania "new gun" AND a flyback in a CTC-16. This was I think in 1984, and I remember my uncle being suprised then that a roundie was available and that the customer was willing to spend the $$$ on that set.
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