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Old 26th Nov 2014, 10:06 am   #1
terrybull
Octode
 
Join Date: Jan 2011
Location: Southwell, Nottinghamshire, UK.
Posts: 1,779
Default Why were the RPM speeds of records chosen

Another thread sparked this thought. Was there any reason why 78, 45 and 33 (33 and a third I think) chosen. I realise it is all a compromise between playing time and frequency response but why those speeds and perhaps if 75 rpm etc had been used I would be asking the same question but just wondered if there is some reason for the specific reason for the final choice.
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