[time-nuts] Glass Envelope Quartz Crystals
kb8tq at n1k.org
Tue Feb 2 17:39:33 EST 2016
Anything that causes “delta C” between the leads is probably a bad idea. Most
3D printing materials are relatively unstable as capacitor dielectrics.
> On Feb 2, 2016, at 10:51 AM, Daniel Watson <watsondaniel3 at gmail.com> wrote:
> I have added a picture of the bottom of the 5 MHz crystal. The other one
> has a similar pin arrangement, two pairs twisted and soldered together,
> except they aren't cut as short. The seller indicated they were
> manufactured in Russia for military use.
> If a suitable socket cannot be found, I thought about 3D printing little
> stands for them to sit on when soldered to a board.
> On Tue, Feb 2, 2016 at 6:54 AM, Tim Shoppa <tshoppa at gmail.com> wrote:
>> Interesting! Date code from the 90's? Russian, right?
>> They certainly look like common 7 pin miniature tube pattern.
>> But unlike a real 7 pin tube that actually has stiff Cunife or Fernico
>> pins, it looks like you have just tinned wires out the bottom of yours, and
>> your pics don't show the bottom of the tube, but it looks like outside the
>> glass the wires from two different pin-holes are wrapped together?
>> For testing purposes I don't see any problem using a 7-pin miniature tube
>> socket if you have it on hand and carefully inserting the pairs of twisted
>> wires into the socket holes.
>> But for more permanent use seems to make more sense to solder the pins to a
>> PCB if they are tinned already.
>> Tim N3QE
>> On Mon, Feb 1, 2016 at 9:58 PM, Daniel Watson <watsondaniel3 at gmail.com>
>>> I purchased a pair of interesting glass envelope crystals for a project.
>>> Here are some pictures:
>>> Does anyone have an idea about what mount/socket I should buy for these?
>>> read a previous thread on the list about Bliley crystals using a B7G
>>> 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
>>> Thanks much,
>>> Dan W.
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