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21 inch round color tubes were all electrically and physically interchangeable, as a rule. The major differences were in the phosphor composition improvements over the years.
The 15GP22 is a unique item both physically and electrically, using electrostatic instead of magnetic convergence, for example. The CT-100 chassis will not drive any later tube.
The choices are a working 15GP22, or a CT-100 cabinet with guts removed and replaced by a flat panel display, hardly a restoration.
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Old TV literature, New York World's Fair, and other miscellany
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