Recently I questioned the reasons why my 1954 RCA 21CT55 with its first full NTSC spected CTC2B chassis and the last roundy 21FBP22A crt produced picture quality almost comparable with my solid-state, comb-filter 1984 and 1992 Sonys. I checked all the RCA schematics from the CTC4 up to the CTC38, tube types and also the all solid-state CTC40 of 1970. All of them have narrow bw chroma processing and hi level crt luminance/chroma combining. Did RCA ever go back to wb IQ video processing? The dramatic difference in picture quality between wb IQ and nb R-Y/B-Y was obvious to me in 1964 as related in my first AK message of March 28, 2008:
……..When I bought my 21CT55 for $50 in '64, I brought it into the house after I got it working and ran it along side my Dad's old CTC4 he left me. Both had 21FBP22s so it was a good comparison of narrow bw color R-Y B-Y vs. full bw color I Q. The extension of full color into fine detail on the CTC2B was startling! Color persisted in fireworks until extinction which I never saw before. The CTC4 fireworks turned into white long before extinction. The CTC2B carried full color way into the shadows, the CTC4 went gray to black……I get really awesome displays on the 21FBP22A with vibrant, accurate color shading. Having the CTC2B's super wide dynamic range due to full bandwidth I Q demodulators feeding low level I-Q-Y matrixing to the CRT grids only. I kept the CTC4 in the house for the kids but brought the CTC2B back to the garage workshop for further study…….
I have assembled a Flickr photo post:
http://www.flickr.com/photos/tomcomm/
After selecting a thumbnail, click on “all sizes” above picture to enlarge to full screen. Two clicks of the Browser’s “Back “ returns to thumbnails.