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 <[email protected]>
Data: 02/02/2016 13.15
A: "Discussion of precise time and frequency measurement"<[email protected]>
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 <[email protected]> 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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