[time-nuts] Glass Envelope Quartz Crystals

[Tim Shoppa]

Jeremy, do you remember the base that was used on that HP standard
crystal-in-glass? I remember similar looking ones (not HP... maybe General
Radio? ... probably from the 1960's) fitting into something like the big
old bayonet two-pin lamp sockets or even having screw-in candelabra bases.

Tim.

On Tue, Feb 2, 2016 at 10:04 PM, Jeremy Nichols <jn6wfo at gmail.com> wrote:

> The OP's picture looks very much like the crystals that HP's "Frequency
> and Time" division in Santa Clara (02 was their division number) used to
> manufacture back in the 1970s. My picture shows a 1 MHz crystal that HP
> used in the predecessor to the HP-105A (perhaps the 101A).
>
> Jeremy
>
>
> http://s323.photobucket.com/user/Jeremy5848/media/Miscellaneous/Crystal_1140587_zps0jxjpoal.jpg.html
>
>
>
>
> On 2/2/2016 12:24 PM, Don Latham wrote:
>
>> You have it right, iovane. At the least, they should be protected from
>> light,
>> thermal radiation, and emf.   Won'drous things will happen if the crystal
>> and
>> its structure are subjected to radiation through the glass. I'd suggest a
>> foam
>> wrap in a tin can as a minimum. Put the oscillator cat in there too.
>> Don
>>
>> iovane--- via time-nuts
>>
>>> 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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>>
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