[time-nuts] Cesium Clock Avialable

paul swed paulswedb at gmail.com
Sat May 19 13:36:03 EDT 2018


Bobs
Comments are on target.
The Cesium can last a long time on the shelf. But (Always a but) other
stuff in the tube tends to pollute the tube.
This causes the high current when you start the system that may or may not
clear up.Some great time-nuts threads on the subject and how to attempt to
recover the tube.

In my experience after the tubes up and running and in a locked state. The
beam current is relative. About 20-40 is good.
The issue is there are some settings that can totally fake this reading out
like the meter sensitivity. As the current goes down you see more of the
noise floor of the system that deteriorates the quality. Funny fact
Frankenstein 5060/61 mix has barely originally showed .5 on the beam
current. Yet still locks. Today beam current is 0 and its still locks. The
tube was deemed dead when it was given to me. In comparing it to another
much later 5061 it is indeed locked nicely.

The option 004 tubes run hot and consume Cs more rapidly. Dead 004 tubes
are pretty much dead.

As I recall in the manual there is a way to directly read the true beam
current (If you actually have any) right off the tube.
So some lucky sole in this tread will finally have a real ticking clock.
Congrats and have fun. I think the darn clocks go for as much as Doug is
asking. Shipping was about $130 or so from Az to Ma about a year ago when I
picked up my 2nd 5061.
I think this is a bit cheap as it came from a company that most likely gets
a discount we don't.

Regards
Paul
WB8TSL


On Sat, May 19, 2018 at 1:02 PM, Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
>
>
> > On May 19, 2018, at 11:22 AM, Dana Whitlow <k8yumdoober at gmail.com>
> wrote:
> >
> > Don't Cesium clocks have a beam current integrator of sorts so that it's
> > possible
> > to pretty accurately assess the remaining life of the tube?  If not, I'm
> > terribly
>
> Simple answer - no. The ones we are playing with came out *long* before
> you could do
> anything like that in a practical way. Even today I know of no atomic
> standard made by
> anybody that does something like that.
>
>
> > surprised and disappointed.
> >
> > Also, beginning with a new tube, roughly how long can one be run until it
> > reaches exhaustion?  Are we speaking months, years, decades, or what?
>
>
> Rated life on a high performance tube is in the 5 to 7 year range. I have
> indeed proven that
> to be correct with a couple of tubes run on a 24/7/365 basis. A “standard
> grade” tube should
> run for 2 or 3 times that long. A lot depends on exactly which model tube
> from what era and
> who made the specific tube.
>
> Tubes are not the only thing that dies in a Cs standard. The older ones (
> = what we play with)
> are mostly full of leaded parts described in manuals and schematics. They
> may not all be made
> anymore, but various substitutes are out there. Also, chassis for Cs
> standards with dead
> tubes are pretty common. It’s the tubes we are most likely to run out of ….
>
> Of course you *can* get a nice new tube from the factory. Last time I did
> that the bill was
> about $38,000. That included them putting it in.
>
> Bob
>
> >
> > Dana
> >
> >
> > On Sat, May 19, 2018 at 10:01 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
> >
> >> Hi
> >>
> >> Unfortunately there really is no way to tell how much Cs is left in the
> >> tube. You can
> >> look at beam current and make a guess. All that really will tell you is
> >> that the fuel
> >> gauge is on empty or at least just off of empty.
> >>
> >> Bob
> >>
> >>> On May 19, 2018, at 2:30 AM, Paul Bicknell <paul at bicknells.f2s.com>
> >> wrote:
> >>>
> >>> Hi Doug
> >>>
> >>> Is it possible to test its operation and
> >>> can the time left on the cesium be calculated   Regards Paul
> >>>
> >>> -----Original Message-----
> >>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Doug
> >> Millar
> >>> via time-nuts
> >>> Sent: 19 May 2018 05:04
> >>> To: time-nuts at febo.com
> >>> Subject: [time-nuts] Cesium Clock Avialable
> >>>
> >>> Hi, I am willing to part with my HP 5061A cesium standard and manual.
> The
> >>> unit was rebuilt and functioning some years ago and not used since
> then.
> >>> There is usable cesium in the tube and the unit worked. I have not
> >> tested it
> >>> recently. It has a Patek-Philippe analogue clock in the front. The unit
> >> is
> >>> in great physical condition.  Asking $600 plus shipping from Long
> Beach,
> >> CA.
> >>> 90806
> >>> I also have an ESI 242D resistance calibrator and a Julie primary
> >> resistance
> >>> standard in an oven. Let me know if you are interested. Very
> reasonable.
> >>>     Thanks, Doug K6JEY
> >>> _______________________________________________
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