PC: Early Betamax

What year could have been the earliest for Sony to come out with the Betamax cassette if they were able to do so sooner than 1975?
 
What year could have been the earliest for Sony to come out with the Betamax cassette if they were able to do so sooner than 1975?
Earlier machines in the early '70s had to be on 3/4" tape due to limitations on electronics to keep decent broadcast quality, so that meant big cartridges like this Sony U-Matic that predated Beta
umatic_tape_pic.jpg


The 1/2" tape cartridges made by Philips, Sanyo and Sony were limited in playback length as well as poor quality before Betamax
 
Earlier machines in the early '70s had to be on 3/4" tape due to limitations on electronics to keep decent broadcast quality, so that meant big cartridges like this Sony U-Matic that predated Beta
umatic_tape_pic.jpg


The 1/2" tape cartridges made by Philips, Sanyo and Sony were limited in playback length as well as poor quality before Betamax

Oh yeah, I heard of those.
 
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