[TVBeeGee]

Yes! I remember orange looking original filters in the red channels. I think some engineers may have found that this allowed the red channel to respond too much to colors between red and green. Perhaps this might have been an RCA attempt to keep skin tone from tending toward green, but as I recall it may have reduced the ratio of the red channel output to pure reds, causing a loss of saturation on pure reds. In other words, red gain might have been set lower on a chip chart with the orange filters due to that channel seeing a broader spectrum from white light, causing output during pure reds to be proportionally lower. Just a guess.

Matching vidicons to achieve proper grey tracking must have been very difficult and time consuming. The addition of gamma controls must have been quite a welcomed change! Ditto with trying to get things to track during varying target voltages.

I knew ABC ran film out of NJ to avoid NYC film tax, but never knew NBC did the same trick. Interesting.