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Hi Jerome!
Interesting articles. The NEC TT-3000 1" machine has a big drum, 120mm diameter. Not quite as big as A and C format but I think it's smaller than IVC700 etc.
The 33 page article has photos of the original Ampex VR1000 and what looks like an RCA TR70. There's also a curious looking quadruplex machine with two headwheels. If it was intended to be used as a profanity delay, it would have only been a second or so.
In the early days of videotape, there was a huge proliferation of formats. Mainly in the industrial market rather than broadcast where quadruplex reigned supreme for almost 20 years.
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