[time-nuts] Old Crystal.

[Jeremy Nichols]

Here’s something similar, made by HP a in the early 70s. It’s a 1 MHz
crystal, used in a predecessor to the 105B Frequency Standard. Similar
construction to yours.



On Sun, Feb 28, 2021 at 4:10 PM Bob Albert via time-nuts <
time-nuts at lists.febo.com> wrote:

>  Is that a PR Peterson Radio logo?
>     On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen <
> dan at irtelemetrics.com> wrote:
>
>  Hi All,
>
> I've picked up a couple of old crystals. Mostly because they look neat.
> They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm
> thick. Was able to get them to oscillate using a Colpitts circuit. They
> will oscillate at 2.851Mhz (probably some strange mode)  if given the
> chance.
>
> I've been scouring my reference books here, and haven't had much luck
> finding any details on how one would even guess at the parameters of a
> quartz like this.
>
> There area few numbers on them, 33 stamped on the side, 1000 (KHz???) on
> the top, 87 on the top, and hand written 501 (probably a SN). Digging on
> line, I'd guess an AT cut based on thickness. I'm guessing the 33 is
> capacitance in pF. 87, might be year.
>
> If any of you have any suggestions on where to find information on how
> to get something like this to oscillate properly, guess at correct
> parameters, or even measure any of the parameters I would really
> appreciate it.
>
> I'm sure these are really nothing special, but it would be neat to give
> them a fighting chance to show what they can or can't do without
> breaking them!
>
> Thanks,
> Dan
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-- 
Jeremy Nichols
Sent from my iPad 6.
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