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Edison DD diaphragm

https://forum.talkingmachine.info/viewtopic.php?t=22920

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Re: Edison DD diaphragm

Posted: Mon Sep 07, 2015 11:40 pm
by Phonoboy
Test #2 improved diaphragm. https://youtu.be/-Gf2RKNNPZ8
Flatter, paper rings removed, slight cone shape added to top.
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