[Hallicrafters] Piesoelectric effect case in point.

[rbethman]

Richard,

The 1954 Shure 737 uses a large gold coated quartz crystal attached to 
the diaphragm at the corner of the crystal.

I can take take the head open and take pictures for those not inclined 
to have the sense to check and find out which microphones had what.

Bob - N0DGN

On 1/2/2011 6:46 PM, Richard Knoppow wrote:
>
> ----- Original Message ----- From: "rbethman" <rbethman at comcast.net>
> To: <hallicrafters at mailman.qth.net>
> Sent: Sunday, January 02, 2011 12:50 PM
> Subject: Re: [Hallicrafters] Piesoelectric effect case in point.
>
>
>> Well, as Carl pointed out, first the proper spelling is piezo.
>>
>> I can see this with quartz.  The 1950's Shure element is one big slice
>> of quartz.
>
>    Neither "crystal" or ceramic microphones are made of quartz. Quarts 
> is used in frequency control and filter crystals but the material in 
> crystal microphones is "rochelle salt". The ceramic is another 
> material but that _is_ related to the dielectric used in capacitors. 
> All this infomation is available on the web.
>
>
> -- 
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
>

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