[time-nuts] Cesium tube ion pumps

[WB6BNQ]

David,

It would seem to me that while you have a warranty it would be prudent to exercise
such a warranty.  Otherwise, you will be fooling around till the last minute and be
out of luck.

If it sat "off" for three years and you have only had it operating for a short while,
unless I misunderstand something, it seems that there may have been a problem with
tube from the start ?  Out of curiousity, perhaps Corby can enlighten us on that
aspect ?

Bill....WB6BNQ


aceamusements at mchsi.com wrote:

> Corby,
>
> AT what point would be approp to call symmetricom and complain about defective
> tube?I still have 2 years on the 5 yr warranty left, but how do u explain this
> (defect),,(I assume it will just keep rising and eventually ruin the tube within
> a few yrs?)last I checked they wanted about 28k for a new tube.
>
> the unit with high perf tube has 5 yr warr from date of manuf. and cost 59k new.
>
> ----------------------  Original Message:  ---------------------
> From:    Corby Dawson <cdelect at juno.com>
> To:      time-nuts at febo.com
> Subject: [time-nuts] Cesium tube ion pumps
> Date:    Wed, 3 Dec 2008 22:11:16 +0000
>
> > David,
> >
> > The long storage is not the cause. Extended operation of the ion pump
> > causes the "whiskers" to grow. They can give rise to field emission
> > leakage currents.
> >
> > This manifests as a raised ion pump current but does not inhibit proper
> > operation unless the current gets too high.
> >
> > I don't remember at what current a 5071A will shut down at but I can take
> > a look in the manual.
> >
> > Corby
> > ____________________________________________________________
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