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Some sets cut the video and chroma off while in service mode, others don't (including most RCA sets). You have to manually turn the bright, cont, and color all the way to minimum to get an accurate service line. If you don't, you'll get a false setting since you're fighting against color and video. In the case of a CTC-16, you should set the bias switch to min or middle, depending on how strong the CRT. Some techs like to get a faint gray line, but I like to just barely black out each color.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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