In addition to the post guys "stroke" material, there is a link on the site that Buccanears linked to titled "Ye Olde Radio Museum".
Here is the direct link:
http://www.pharoahaudio.com/yeolderadiomuseum.html
I haven't had a chance to read more than just a tiny bit of it, but it details the restoration of several old radios.
Since my voice probably came through some of them back in my "radio days" (just kidding...I'm not
that old) I found even the tiny bit I read absolutely fascinating...