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Technically yprpb are the luminance and x and y chroma decoder output channels on any xy color demodulation tube set... granted you need to delay the y to reach the CRT at the same time as the chroma, and video amplification and or inversion needs vary from set to set.
You can get yprpb out of rgb by preforming signal addition and subtraction with video op amps...it all depends on how much you want to bother to mod a given set.
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