Another RCA CT-100 discovery B8001599

[trinescope]

Originally Posted by old_tv_nut

The CTC7 and later chassis used the X-Z demod with output matrix/amp/DC restorer stages. Any direct R-Y/B-Y parent would not apply. Plus, it was more stable with tube drift due to the final DC restoration.

So did the CTC5 Deluxe; that one appears to be the first time RCA used the X-Z scheme. The demodulation angle, according to the RCA service data, is 57.5°. That got played around with in later chassis using the FBP/FJP CRTs due to the all sulfide phosphors those tubes used in an attempt to get subjectively correct color rendition from CRTs that no longer conformed to NTSC specs.