[time-nuts] Broken Ovenaire OSC 85-50 - crystal failure ?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jul 4 08:38:00 UTC 2009


Kit

If you are confident of your diagnosis then you have little to lose.
The crystal is defunct and isn't going to fix itself so it may be
instructive to take a peak inside.
However don't the E1938 cans have an internal vacuum?
Some care in opening may be required.


Bruce

Kit Scally wrote:
> G'day Joe,
>
>
> My call on <this> question is: "very seldom with a properly designed
> circuit and crystal" (NO flames please on these descriptions !)
> Having said that, I have a couple of broken crystals from once-working
> HP E1938A oscillators.  All appear to have some form of physical
> fracture or electrical disconnect within the copper crystal capsule. A
> careful shake makes a re-connection but fails if the capsule is moved
> even slightly.
> I've not attempted to butcher a capsule open to determine the cause -
> this to my mind is bordering on the sacrilegious but if given absolution
> from another TimeNut, I may attempt it and photograph the results ...
>
> Regards,
>
>
> Kit
> VK2LL
>
> *************
> Do XTAL's fail often?  If so, by what mechanism?  Slowly fade away?
> Sudden death?  I am not experienced enough to know this answer but in
> all my years with various HAM gear, I do not recall the failure of a
> single XTAL. However, none of these were in an oven.
>
> Thanks again for all the useful information.
>
> Joe
>
>
>
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