Quote:
Originally Posted by miniman82
I have a CTC-7 that will make as good a picture, it's all about how you set it up......
|
This is a subjective opinion I find questionable.
The screen-shot comparisons of my 1954 RCA 21CT55 with its full NTSC spect'd CTC2B chassis and 21FBP22A rare-earth crt produced picture quality almost comparable with my solid-state, comb-filter 1984 Pro Sony. I checked all the RCA schematics from the CTC4 up to the CTC20 tube types. All of them have narrow equi-bandwidth chroma processing and hi level crt luminance/chroma combining. The dramatic difference in picture quality between RCA’s CTC2B wide band IQ and the CTC4 NB R-Y/B-Y was obvious to me even in 1964 as related in my first AK/VK 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 were operating Over the Air and 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 "Show of Shows" fireworks until extinction which I never saw before. The CTC4 fireworks turned into white long before extinction. The CTC2B carried full color burn all the way into black, while the CTC4 went color to 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 , resulting in pure R G B that were amplified and applied 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.”
The CTC4 was RCA’s first attempt at drastic cost reduction with the introduction of NB equiband high level R-Y B-Y demodulation and developed G-Y applied directly to the CRT grids, with high level luma +Y applied to the CRT common cathodes. This basic CTC4 configuration persisted with slight variations thru CTC5, CTC7, CTC9, CTC10 and beyond, producing quite acceptable quality pictures. However, only a side by side comparison in real time like I configured in 1964, would demonstrate the obvious superior fine-detail performance of the wide-band CTC2B. This is possible for the few VK members who have both an operating CTC2B and also later RCA roundys but impossible for me with only a single 21CT55 and a comb-filtered Sony Pro Monitor. I must therefore rely on the "stitched JPG" screen-shots I posted in this thread.
Hopefully other VK members will attempt to duplicate the "stitched jpg" screen-shots presented in this thread using a wide-band CT100 or 21CT55 and later narrow-band RCA roundys. I could provide the original 1024X768 jpg pics I used if requested........Tom