[time-nuts] CS reservoir depletion

[J. Forster]

In your dreams.

There was a very nice HP Cs there a few years ago, but it had a properety
tag that I recognized. I knew that unit had a known bad Cs tube, as I seen
it at a company surplus sale a month before,  but that didn't stop the guy
hawking it as "working" for well over $5K.

Caveat Emptor!!

-John

==============


> Tom
> That is one thing I noticed even without the CS the system is very stable
> with the Xtal.
> My comment was tagging on to a previous one and I couldn't resist the fact
> that I get might old stuff.
> Good comment on the standard. Indeed I run my 5065 every month or so for a
> day or two insuring its stable and no problems have or are cropping up.
> My 5061 came from the Naval observatory. I just know the next hamfest or
> MIT
> flea I will find a new tube for it for $10 or 20. Not to likely.
> Regards
>
> On Fri, Jan 14, 2011 at 1:01 AM, Tom Van Baak <tvb at leapsecond.com> wrote:
>
>> Hi Tom been quite a while hope you are well.
>>> The never run out comments, not from me. Look at the
>>> previous thread I tagged onto. My humor is that most of
>>> the CS tubes we get are very long in the tooth usually
>>> way past whatever anyone would say they are good for.
>>>
>>
>> That is so true. It always amazes to pick up a 30 year old
>> 5061A and find that it still works. Sometimes the reason is
>> that it is already on its 2nd or 3rd replacement tube before
>> it went to surplus. In which case you're happy for years.
>> Other times it may be that the 5061A was used only very
>> intermittently and the tube is the low S/N original.
>>
>> A real gem would be one that was kept in cs-off mode except
>> for a few hours once a month to keep the OCXO within some
>> loose cal lab spec. Even after decades it would be as good
>> as new.
>>
>> For many frequency applications there is no reason to run
>> in full cs-locked mode. This is also true if you need good
>> short-term stability. The free-running OCXO in most Cs (and
>> GPSDO for that matter) are more stable short-term when the
>> loop is open.
>>
>>
>> /tvb
>>
>>
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