philco schematic (sams 698-4).... So far it looks the same as the ctc15 to me.

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I don't have a CTC-15 to compare it to either, but I see three sound trap adjustments:
A1, tune for minimum response at 41.24 Mhz, along with R19. A11, tune for minimum response at 4.5 MHz (intercarrier, demodulated result of 41.25 MHz).

Still couldn't tell you if the chroma ringing you see is the result of misadjustment or an unimprovable design flaw. The best thing would be a complete IF alignment first including the three sound trap adjustments, then see if it's any better.

I've never attempted the IF alignment before. And while I have 2 of those sweep signal generators - neither works. It's something I definitely want to learn to do, but as I said in another thread I'm moving to the other side of the country (with all my sets and other junk) soon, and I don't want to start anything new until I'm relocated probably a little over a month from now, so the Philco will have to sit as is for a while. I'll try and get up the sams for the ctc-15 for comparison to the Philco schematic in this thread later this week.