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Originally Posted by old_tv_nut
I can't remember if I ever saw a design implementing a "picture" control with mechanically ganged "contrast" and "color" controls - anybody remember such a thing?  |
The CT-100 and the 21-CT-55 (basically a 21-in. CT-100) both used a ganged pot assembly to control luma and chroma simultaneously. For some reason however a production change to the 21-CT-55 bypassed the chroma pot, leaving only the luma pot functional. The user color was a separate pot in all cases, of course.
Back to the drawing board. I located the vintage matrix alignment procedure that includes adjusting L141, the inductor in the hue control circuit. This is where a course adjustment to the hue control takes place.
These main and alternate procedures seem to use the old non-luma-progression color bars Old_TV_Nut referred to earlier, who must also be the one to ask this question: ten years ago I worked on military stuff that used multiplying DAC's to contol what amounted to audio-frequency-range levels; is that how the function is or was implemented in TV for audio gain, contrast, and whatever? Is it even a good question?