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A slight refinement - I said that the change in the blue phosphor was mostly ignored. This may have been true early on, but by the 70s, people were doing full matrix calculations for receivers to minimimize the overall errors, and the phases and gains of (R-Y), (G-Y) and (B-Y) were all adjusted, unfortunately differently in each maker's sets.
I also didn't mention the setting of white point to a very cyan "9300K + 27 MPCD," isntead of the standard "Illuminant C," which made the choices for the receiver matrixing (gains and angles) very subjective, and in fact, led set owners to make wide variations in preferred settings, depending on source variations and how their visual color adaptation was reacting at any particular time. This white point along with the response of the TK-41s to polarized light reflections from hair resulted in a lot of complaints about green hair in the early days.
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