[miniman82]

The 4 itself was a narrow band (high-level) demod scheme, truely one of a kind when it came to engineering.

When you say 'simulated' I assume you mean on a computer, right? Those programs can be wildly inaccurate, especially when it comes to tuned circuits. As you said, stray cap/ind can have a profund impact on high frequency circuits- I'm not sure I would trust a computer to be able to figure it all out.

That said, it is generally accepted that all chassis beyond the CTC-2(B) are narrowband. I have heard there was a version of CTC-5 with wideband demod, not that it matters since the insufficient HV production of that chassis would tend to make it impossible to enjoy anyway. Not quite sure why people make a huge deal about it to begin with, the human eye is largely insensitive to color information but very sensitive to changes in brightness- a fact the NTSC took full advantage of. The main reason people associate wide band color demod with good color reproduction is its simultaneous marraige with the 15GP22 CRT, I strongly suspect that you wouldn't be able to tell the difference between a 15G driven by a CTC-2 chassis or a CTC-9.

If you really want to know, you would have to sweep the color sections of the individual chassis. But looking at the schematics (which didn't change a whole lot after about 1956/1957 or so), it becomes aparant that RCA had it figured out narrow band style by then anyway- it was a cost thing more than it was a color quality thing, because like I said people didn't really notice a difference.