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#1
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The image size on a 21" round tube is probably close to that of a 24" rectangular (b&w) tube, the difference in measurement coming down to the presence or absence of the corners of the frame.
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tvontheporch.com |
#2
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Yes, 24 inch. NTSC raster is 3V:4H:5 Diagonal. The "21 inch" round tube is actualy 19+" viewable, so 19 x 5 /4 = 23.75 viewable.
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