Hi
Best guess is that it’s a 1 MHz fundamental. Your magic circuit is
running it on the third overtone.
Past that:
AT cut? Probably.
32 pf load? maybe.
Heated application? maybe.
Russian manufacture? yup
Bob
> On Feb 28, 2021, at 6:35 PM, Dan Kemppainen <[email protected]> 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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