[78-L] Interesting Columbia Viva-Tonal

[Bud Black]

Every cloud has a silver lining.  What better way to determine the exact rotation speed of the recording?

Bud

Sent from my iPad

On Feb 26, 2012, at 9:17 PM, Ken Matheson <kenmath at yahoo.com> wrote:

>    I have found it before in 78's. I don't think it was a problem with crank phonographs.
> But with modern playback equipment with good fidelity you can hear it. If you have the equipment or software you can notch it out. If in a US recording 60 cycles could be caused by a poor ground, on mike etc. 120 cycles, bad filtering in a power supply. 180 could be in a power feed in a large building.
> Ken
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