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Having a restored CTC-5 at home has made it clear that the early sets were not at all stable with signal variations. No chroma automatic gain control to take out variations with antenna tilts, ghosts, and fine tuning adjustment - that is a very big factor. Also, the chroma and contrast controls not being ganged - every time you adjusted contrast, you had to readjust color level. Then, considering the distribution equipment was all tubes and subject to drifting, there was no hope that you could change channels and not need a color adjustment.
I also agree with the assessment that the average person could not adjust a color set. A lot of people just do not have an analytic mind that can separate out the effect of one control at a time, even though the owner's manuals gave clear instructions of what each control did, for example, giving three pictures, one with too much color, one with too little, and one that was normal. People can see when a picture isn't right, but analyzing what they are seeing is impossible for some. I'll bet everyone here has had a call from someone whose set is acting up and realized the impossibility in most cases of getting even simple questions answered about just how it's acting up.
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