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The July, 1972 edition of Electronic Servicing Magazine has a detailed article called "How Color Bars are Produced." I just read most of it, and they hit on the various methods of producing the color bars, including that used in the RCA WR-64. If you want the 25-cent version, read old_tv_nut's two earlier posts - he nails in several concise paragraphs what Electronic Servicing took 4 pages to detail.
I can scan the article and post a PDF, but old_tv_nut's explanation is the nutshell....
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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