[78-L] Groove spacing - groove width

J. E. Knox rojoknox at metroeast.org.invalid
Mon Nov 21 09:17:01 PST 2016

Greetings from FixitLand!

Ron Roscoe wrote:

> ...However, this link www.esotericsound.com/Electronics/REQ2MAN.pdf gives you
> access to the most comprehensive listing of recording curves for both 78 and
> 33 rpm discs.  There are FIVE pages of playback curve equalizations.
> Incidentally, ***this chart shows that RCA didn't begin to change its turnover
> frequency upwards until around 1935-38 ... ***
[emphasis added]

Spectrum analysis of the records tells a different story. Don't believe everything you find on the Internet.

Take care,

“Women and cats will do as they please, and men and dogs should relax and get used to the idea.” — Robert A. Heinlein

*Celebrating 30 years of service.*

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