[AMRadio] D104 element Rebuilding

david knepper collinsradio at adelphia.net
Sun Nov 19 22:36:40 EST 2006

Jack, these mike elements were advertised by Astatic as being made from 
Rochelle salts.

Dave, W3ST
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----- Original Message ----- 
From: "Jack Schmidling" <jack at schmidling.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Sunday, November 19, 2006 4:02 PM
Subject: Re: [AMRadio] D104 element Rebuilding

> Jim Candela wrote:
>> Many years ago my Astatic 'Rochelle salt" crystal element died from
>> prolonged exposure in my garage. The output from it was low, and
>> distorted. With a burst of curiosity, and desperation I took the bad
>> element apart.
> Feeling I had nothing to lose, I did just that yesterday but used sili 
> glue to hold it all together.  It was an interesting learning experience. 
> Unfortunately, it didn't help my problem but mine was working; just not to 
> my satisfaction.
> It still works about the same so I ordered two new cartridges from Mouser 
> to see if it's me or the cartridge.
> I had been wondering how age/time/humidity could have the slightest effect 
> on a quartz crystal millions of years old.
> Turns out they are not quartz at all but Rochelle salt which, like all 
> salts, are very hygroscopic and turn to mush in time.
> js
> -- 
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