[time-nuts] Glass Envelope Quartz Crystals

Alex Pummer alex at pcscons.com
Sat Mar 26 14:49:58 EDT 2016


I am perhaps to late now,I found the e-mail recently:
"
> 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


"


the glass packed ones will have much better vacuum, therefore higher Q
I still have some KVG glass envelope crystals [116MHz overtone] from the 
60 -ties
73
KJ6UHN
Alex

On 2/2/2016 2:37 PM, Bob Camp wrote:
> 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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