I can't refer to the other "COLORTRACK 2000" receivers, but the CTC-133B (1985/86) is a wide
band receiver, using IC's made by NEC of Japan, utilizing IQ demodulation. The CRT seems to produce better reds than some of RCA's previous models. I have a copy of this chassis, and it is a very good performer as far as color reproduction goes, but is does not produce what I would call a bright picture, perhaps due to the choice of more accurate phosphors at the expense of brightness. The only trouble I have had with it is a failed audio chip, and an open resistor on the CRT board, both easy repairs.
I have a CTC-4, CTC-5N, and CTC-7. RCA specifies "X and Z" demodulation in the deluxe CTC-5N, and subsequent chassis, which is , I believe, narrow band demodulation, although with improved circuits over the model years. All can produce excellent color pictures, within the limitations of their design, as can the CTC-5 Special, as has been demonstrated on this forum.
Kevin