Vinyl records are referred to based on rotational speed The RPM’s, or revolutions per minute of the more popular vinyls are:

 

45s

33 1/3

78s

Other features of vinyl records included reproductive accuracy or “fidelity” (High Fidelity or Hi-Fi, Orthophonic and Full-Range), their time capacity (long playing or single), and the number of channels of audio provided (mono, stereo or quadraphonic).

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