science behind Orthophonic horn/reproducer

[Nat]

Can anyone tell me what thread it was where the match and science behind the orthophonic horn & reproducer was so clearly explained? Or a link to the site where the essays originated? There was a whole history of the development of victor horns and reproducers that was very helpful...I seem to have lost my link...

Thanks,

Nat

[melvind]

Here are a couple of links that might help.

http://www.gracyk.com/credenza.shtml




[youtube]http://www.youtube.com/watch?v=sK8vGFI0hqw[/youtube]

[OrthoFan]

JohnM provided an excellent and condensed description in this post string:

http://forum.talkingmachine.info/viewto ... f=2&t=3985

"The re-entrant horn ... is part of an electro-mechanical equation that consists of a number of factors beginning with the electrical recording process and the resultant recording on one side of the equals sign and the phonograph and it's component parts on the other side. These components include the reproducer (actually a lever-action transformer for purposes of the equation) and it's sub-values that include the ratio of the distance from the needle tip to the pivot bearings of the stylus bar, and from the pivot bearings to the center of the diaphragm. The distance that the record groove on one side of the pivot flexes the diaphragm on the other side of the pivot is calculated to move a column of air with the exact displacement of what the re-entrant horn contains. Also, the horn is expanding at the proper mathematical rate to process that column of air. ...."

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This goes back a number of years, but this page deals more with the math behind the design -- http://www.angelfire.com/nc3/talkingmac ... odels.html


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Also, there used to be quite a lot of information on the old "Recording Technology History Notes" site, which apparently no longer exists. I was able to find a copy saved at the Internet Archive site --

Main Page -- http://web.archive.org/web/200610071708 ... notes.html

Electric Recording pictures & articles -- http://web.archive.org/web/200609030143 ... ortho.html

HTH,
OF

[Nat]

Many thanks! Fascinating stuff!

Nat

[JohnM]

I wrote an essay for the Birthplace of Country Music Alliance website entitled New Technological Forces Reinvent The Music Industry. The essay may be found here (subsequent chapters are accessed from the menu on the left of the page):
http://www.birthplaceofcountrymusic.org/node/34

The section on the technology of electrical recording may be accessed directly here:
http://www.birthplaceofcountrymusic.org/node/38