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Originally Posted by frenchy
So a 21 inch roundie is basically the same as watching a 27" tv with a mask put around it that carved off the corners, interesting. Shows that these were actually pretty darn big as far as screen size, especially for those early days. A person's face would appear larger on one of these than the standard rectangular 25" sets that prevaled for so many years after that.
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I suspect that they would all produce a picture about the same size as the 27" Whirrled One describes.
The original 25" rectangular tubes from the 60's became "23v" when the viewable area law came about. New 21" roundie tubes became "19v" Still the same tubes. In the 70's they came out with "25v" tubes, and called them 25" sets again. They were the same size as "23v" tubes, but with squarer corners. A modern 27" has even squarer corners than a "25v" from the 70's.
John