[old_tv_nut]

My only guess is that they felt that some color in the details was useful and maybe they also felt that the quadrature distortion would not be so visible at normal viewing distance (ten feet) as to make it objectionable. In my experiments at Zenith, viewing was in the usual engineer's mode - from two feet or closer.

As was stated above, the bandpass was narrowed to be equiband in later chassis.

Edit: it occurs to me that the luminance delay should be shorter in the Deluxe chassis than in the super, if the chroma rise time in the Deluxe was faster.