[78-L] Lacquer discs recorded at 80 rpm

[Jeff Lichtman]

>I believe 80 was used for film playbacks because (a) 80 was easy to check for
>speed (20 revs in 15 seconds) . . .
>
>dl

Also, it is possible to use a strobe disk to calibrate to 80 RPM with 
either 60 CPS or 50 CPS, so the speed can be set exactly with either 
60-cycle or 50-cycle current.


                        -        Jeff Lichtman
                                 jeff at swazoo.com
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