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Thanks for the post - I hadn't seen this article with the full explanation before. Motorola called this the "SODPIL" for "self-oscillating detecting phase injection lock". You really couldn't get accurate color, because the G-Y signal is weaker than it should be. The result was weak greens that tended to brownish or bluish depending on the control settings. Some models of this chassis also included a third customer control that adjusted the DC balance between R-Y and B-Y. This was labeled "TINT". You could adjust this even on black and white programs (since the outputs were DC coupled to the CRT), to get a sepia or blue-tinted picture.
The oscillator part of the circuit is also known as "electron coupled", since it operates between the lower electrodes and its output goes via the flow of electrons to the demodulator grids and plates.
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