[ARC5] Can old crystals be restored ?

[Scott Johnson]

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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