[old_tv_nut]

This effect has to be electrical, not the phosphors.
I have never heard of the phosphors giving everything a greenish tint.

However, the usual white balance for sets for decades was on the cyan side ("9300K + 27 MPCD") due to the dimness of the red phosphor and a desire not to overdrive the red gun too much. (This was not true of the very earliest sets such as the CT-100, as they were supposed to be set to illuminant C [daylight white] even though this meant pushing the red gun extremely hard compared to the green and blue.)

By the way, I suspect that CT-100 as used in the home varied greatly, as servicemen had no instruments to tell them when they had achieved the correct white balance. Grayscale tracking (whites and grays being the same color) is much easier to judge by eye than the actual color of those whites and grays.