[ARC5] Can old crystals be restored ?

[Richard Knoppow]

    I think Virgil Bottom addresses this in the paper I linked. I don't 
remember what I read but I think you are right.  The manufacture of 
crystals was strictly a cottage industry until the discovery by the 
military of the value of crystal controlled communications, then it 
expanded very rapidly. Business that had employed anywhere from maybe 3 
to about 50 people grew to thousands of employees.  Previous to the war 
the primary market for crystals was radio amateurs. While broadcast 
stations and commercial communications used crystal control the total 
market was small compared to ham use and overall the business was a 
pretty specialized one.  The paper is really of considerable interest 
both for the information on crystals and for the history of a business.

On 6/11/2016 9:13 PM, Scott Johnson wrote:
> I may be mistaken, but I believe the Galvin Mfg. (Motorola), was by far the
> largest manufacturer of crystals during WWII, I assume that's because the
> built a lot of the crystal controlled equipment that needed them. At any
> rate, it started would become a huge industry within Motorola, the
> development of quartz and other piezoelectric devices such as filters,
> resonators, microphones, and speakers.  Motorola was once the world's
> largest producer of piezo electric ceramic material.
>
> Scott V. Johnson W7SVJ
> 5111 E. Sharon Dr.
> Scottsdale, AZ 85254-3636
> H (602) 953-5779
> C (480) 550-2358
> scottjohnson1 at cox.net
> scott.johnson at ieee.org
>
> -----Original Message-----
> From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Richard
> Knoppow
> Sent: Saturday, June 11, 2016 2:49 PM
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] Can old crystals be restored ?
>
>      As usual I forgot something.  If you read Virgil Bottom's history you
> will discover that the crystal industry was almost completely a result of
> ham radio.  Most of those who got into the business of manufacturing
> frequency control crystals depended on radio hams as their primary market
> until the military began to demand very large numbers of crystals during the
> war.
>
> On 6/11/2016 2:05 PM, Dennis DuValll via ARC5 wrote:
>> Yep, fracture in the wafer.  Not always easy to see.
>>
>> Dennis D.  W7QHO
>> Glendale, CA
>>
>> ****************
>>
>>
>>
>>
>>
>>> On Jun 11, 2016, at 11:32 AM, Kenneth G. Gordon
>>> <kgordon2006 at frontier.com <mailto:kgordon2006 at frontier.com>> wrote:
>>>
>>> In my experience, the only FT-243 which cannot be fixed one way or
>>> another is that the crystal itself is broken.
>>>
>>
>>
>>
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>
> --
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL