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@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 <kb...@n1k.org>
Data: 02/02/2016 13.15
A: "Discussion of precise time and frequency measurement"<time-nuts@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 <watsondani...@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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