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No, many manufacturers designed and built their own chassis. In fact, GE went so far as to develop and register two new tube types for the 15CL100: the 6BU5 pentode HV shunt regulator, and the 2V2 HV rectifier.
The Westinghouse and GE demodulate along R-Y and B-Y, the RCA used the I and Q axes. The Westy, GE, and RCA all have markedly different HV sections, etc.
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