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 Post subject: Edison Diaphragm Question
PostPosted: Sat Feb 20, 2010 4:00 pm 
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Victor IV
Joined: Thu Jan 08, 2009 4:43 pm
Posts: 1183
Location: Toronto, Ontario
Is this diaphragm ( in a Model C reproducer) an Edison product or is it a reproduction from the 1970's? The only diaphragms I have ever seen...other than this one....are the familiar ones with more corrugations. They're usually more oxidized as well. This isn't the shell it came in, by the way. I slapped it in this one just to protect it. It came with a reproducer that I bought about 25 years ago, and I've always been suspicious. Any thoughts O Wise Ones???

Jim


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 Post subject: Re: Edison Diaphragm Question
PostPosted: Sat Feb 20, 2010 11:18 pm 
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Victor IV
Joined: Wed Jan 07, 2009 8:44 pm
Posts: 1581
All I know is that Ron Dethlefson told me that when the diamond disc diaphragms as they had been produced were no longer cost effective to make after the production had stopped, that they produced a copper version. I have never seen one and don't know what they looked like, but they were offered to repair people as replacements if needed for disc machines into the 30's. Maybe that is what this is? He also said the sound quality was nothing like the original..

Larry


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 Post subject: Re: Edison Diaphragm Question
PostPosted: Sun Feb 21, 2010 8:38 am 
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Victor III
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So many phonographs, so little money
Joined: Thu Jan 08, 2009 8:12 pm
Posts: 939
Location: The Garden State
Below are a couple of pictures of a copper DD diaphragm. Construction appears similar to yours.

I had posted about this on the previous board and basically learned that they were available either late in the era of production or after production ceased. No-one knew if Edison or some other concern produced them. I find the output from this repro to be a little lower in volume than the traditional rice paper and cork diaphragms.


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