That is looking really good. The CTC5 Deluxe chassis has wider chroma bandwidth which may partially account for the great performance.
An interesting note: I recall seeing a paper published in the RCA review around 1955 on the effects of quadrature crosstalk in NTSC chroma demodulation. The CTC5 Deluxe chassis stands apart from the CTC4, CTC7 and the chassis's that followed in that the receiver chroma channel sidebands are asymmetrical: that is it is like the I channel in the CTC2 (CT100) chassis. This would lead to greater chroma resolution (approaching 1MHz as opposed to 500kHz on the other simplified chassis RCA sets. The increased chroma resolution would however be achieved at the expense of introducing quadrature crosstalk.
i cannot recall the conclusion of the article in the RCA Review. But I alsways wondered if the CTC5 Deluxe chassis was the outcome of that paper.
The crosstalk distortion would be evident as an odd coliored edge at saturated color transitions. Eg on vertical edge transitions between colors.
Would you be able to to take a close up of a vertical edge where there is a horizontal saturated color transition say between Red and Blue?
The CTC5 Deluxe uniquely would be the only color receiver to demonstrate if the improved chroma resolution offsets any minor quadrature distortion present.
Here in a 1977 RCA Review paper. I was sure I read an earlier paper about is at the time the CTC5 was being designed.
https://www.worldradiohistory.com/AR...w-1977-Mar.pdf