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The British and others made working video tape systems using 1/4" audio tape....To get the needed bandwidth (through tape to head speed) they ran the tape at obscenely high linear speeds (with fixed video and audio heads) that limited the record time of a reel like that to a few minutes. I believe that a working monochrome linear A/V track VTR could be built in that package back then....It just would have had pathetic recording run time.
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