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Old 13th October 2007, 03:05 PM   #1
Netlist is offline Netlist  Belgium
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Default Origin of turntable speeds

I seem to recall a post or even a thread explaining the origin of turntable speeds but canít find it.
Iím particularly interested how 33 1/3 rpm and 45 rpm have become standards and if and how they are related to each other.
Does anyone remember?

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Old 14th October 2007, 08:08 AM   #2
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Default Origin of Turntable Speeds.

Hi there,

see here for a pretty comprehensive explanation.


Cheers, Percy.
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Old 14th October 2007, 08:19 AM   #3
Glowbug is offline Glowbug  United States
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Those were the speeds the squirrels were trained to...

The machine does not isolate us from the great problems of nature but plunges us more deeply into them. - Antoine de Saint-Exupťry
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Old 16th October 2007, 05:10 PM   #4
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I recall reading more than once that the actual numerical rpm choices were the result of gear drives. Before the mid-40s the gear drive was common. 33, 45, and 78 are all whole integer gear ratios. I have never done the math. I assume that there was some sort of motor shaft/rpm standarad that they were stuck with.

33 rpm was already the standard for transcriptions and sound tracks. It is not the ideal speed for LP and has been a curse from day one due to the inner groove distortion.

Once again, I have never done the math. I read this. Mark
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