[time-nuts] Glass Envelope Quartz Crystals

Bob Camp kb8tq at n1k.org
Tue Feb 2 17:37:41 EST 2016


Hi

I think you will find that the Russian versions were used without ovens for a long time. In the US, the only
use for the glass packages past the mid 1960’s was in ovens.

Bob


> On Feb 2, 2016, at 1:43 PM, iovane--- via time-nuts <time-nuts at febo.com> wrote:
> 
> I think that these crystals were designed to be placed in an oven, which worked 
> as a shield too. I have a similar crystal made by Racal in the 60's, and in my 
> case it is fitted with the classic octal tube-type plug. It was housed (still 
> is) in a heavy massive shimmering chrome-plated cylindrical brass enclosure, a 
> beauty to see, It was the timebase of a tube-type synthesizer with lots of 
> tubes. Themperature control was achieved by means of a mercury thermometer in 
> which mercury actuated a contact when reaching a wire crossing the capillary 
> tube.
> 
> Antonio I8IOV
> 
>> Da: Bob Camp <kb8tq at n1k.org>
>> Data: 02/02/2016 13.15
>> A: "Discussion of precise time and frequency measurement"<time-nuts at febo.com>
>> Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals
>> 
>> Hi
>> 
>> Since the 25 MHz crystal has already been soldered into a circuit, putting it 
> in a 
>> socket is probably not a real good idea. It’s also a leaded part. Even with 
> fat pins
>> sockets can be an issue. With wire leads, you are asking for trouble. 
>> 
>> Functionally, there is little there is little difference between a glass 
> package crystal 
>> and a metal package. About the only real one is the obvious - one has a metal 
> shield
>> you can (but sometimes don’t)  ground. 
>> 
>> Bob
>> 
>> 
>>> On Feb 1, 2016, at 9:58 PM, Daniel Watson <watsondaniel3 at gmail.com> wrote:
>>> 
>>> Hi,
>>> 
>>> I purchased a pair of interesting glass envelope crystals for a project.
>>> Here are some pictures:
>>> 
>>> http://syncchannel.blogspot.com/2016/02/glass-envelope-quartz-crystals.html
>>> 
>>> Does anyone have an idea about what mount/socket I should buy for these? I
>>> read a previous thread on the list about Bliley crystals using a B7G mount,
>>> but I'm not sure if that type might work here.
>>> 
>>> Also, when building up a circuit to make these oscillate, are there any
>>> specific differences about crystals in this package that I should keep in
>>> mind?
>>> 
>>> 
>>> Thanks much,
>>> 
>>> Dan W.
> 
> 
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