AFAIK there were only 2 helical 2" formats. An early Ampex one and the IVC 9000. The latter really belonged to theend of the 2" era and gave exceptionally good pictures. Neither was widely used.
http://www.vtoldboys.com/donk01.htm
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This 2” Slant track vtr was a cross between a helical and transverse track recorder, Slightly smaller than an AVR1, the performance was better than High Band Quad but suffered from minor banding effects. One was purchased for BM in September ’74 and a further three a year later for MR (two) and BS.
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