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Some 405 line sets will work on NTSC, but usually they don't have sufficient width, since the horizontal scan rate for 405 is 10125 Hz and NTSC is 15750. The scan circuits in 405 sets don't work very efficiently at NTSC rates.
405 had 3.5 mHz spacing between video and audio, and the audio carrier was below the video, so if you operate a 405 line set on NTSC, you won't get the audio.
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