[time-nuts] Re: So what's inside that Cs beam tube anyway?

[paul swed]

Skip,
I remember your other pictures and do have them downloaded. Now some nice
new high resolution pix.
What I don't understand is the ION pump. I see the HV lead attaching to a
silver circular piece of metal. I sort of thought the ION pump was a getter
electrode. Obviously its more complicated and may depend on the A magnet in
some way.
Regards
Paul.
WB8TSL

On Thu, Aug 31, 2023 at 3:23 PM Skip Withrow via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hello time-nuts,
> Five or six years ago I cut open one of the original HP cesium beam tubes
> and posted some pictures.  I presume they are floating around the net
> somewhere still.
>
> So, I have repeated the exercise with one of the newer (smaller) tubes, and
> thought I would share the results.  Attached are a half dozen photos,
> several are annotated to get the lay of the land.  I have higher resolution
> non-annotated versions if anyone has a desire.
>
> Some observations are:
> 1.  There are four nice holes that can be used to mount the cut open unit
> above a base using screws or standoffs.  And from the scratches appears to
> be how HP mounted the innards during assembly.
> 2.  After these pictures were taken I cut a window in the mu metal shield
> hoping to expose the microwave waveguide.  What did I find - another mu
> metal shield, argh.  It's too tight to get my Dremel tool in there to cut
> through the second one.
>
> I have four (4) of these tubes and three (3) of the older style tubes that
> are excess to my needs.  If anyone wants one I'm willing to ship, but they
> are heavy (about 20 pounds).  The leads are cut off these tubes - they are
> dead.  I would anticipate shipping would be about $35-$40 to the lower 48.
> Please contact me off-list if interested.
>
> Regards,
> Skip Withrow
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