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Why were the RPM speeds of records chosen
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26th Nov 2014, 2:40 pm
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richrussell
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Join Date: Jul 2008
Location: Selby, North Yorkshire, UK.
Posts: 979
Re: Why were the rpm speeds of records chosen
Quote:
Originally Posted by
Radio Wrangler
I wonder if 78rpm happens to have realisable gear ratios to both?
Yes indeed, for 60Hz a 46:1 ratio gives 78.26rpm, for 50Hz a 77:2 ratio gives 77.92rpm. That's certainly close enough.
richrussell
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