The truth about vinyl...

Posted: Sat Apr 28, 2007 12:44 am

But no one mentioned the RIAA EQ curve, (too much to describe, do a search) !!!
The first ME, who taught me how to cut records, used to tell me the RIAA curve is in place to increase recording time, and keep the cutter from going through the bottom!!!!

As Remy explained high frequency preemphasis as a noise reduction, and low frequency deempahsis to make the grooves shallower, and thinner.

The phono preamp reverses the frequency curve.

Posted: Sun Apr 29, 2007 12:42 am

I wish we could add audio to these posts. I kept imagining the Benny Hill theme song as I read through this thread.

Posted: Mon Jul 28, 2008 11:20 am

What a gem!

To be on topic.
If the incoming frequencies' amplitude (RMS) changes the frequency of groves per inch on the disc changes. So modulation in amplification (AM) results in a modulation of the frequency (FM) of grooves per inch-time when viewed center to edge on the disc.
Specifically how the look-ahead tape head processes audio information into adjustments to the speed of the auto-screw on the lathe is magic. But you're tapped in now.

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