[time-nuts] HP5061B Beam Tubes

paul swed paulswedb at gmail.com
Tue Sep 24 00:42:49 UTC 2013


As I mentioned I ran the oven 10 degrees hotter.
To do that I needed to build a new oven controller. Thats was it.
Regards
Paul.


On Mon, Sep 23, 2013 at 6:27 PM, <EWKehren at aol.com> wrote:

> Twelve years ago I did disassemble a regular and a high  performance tube,
> the only negative effect was I joined time nuts. The guts  still decorate
> my
> window sill. The only parts inside that may be temperature  sensitive are
> some copper wires with a clear coating. Every thing else is metal  or
> ceramic.
> Bert Kehren
>
>
> In a message dated 9/23/2013 5:44:22 P.M. Eastern Daylight Time,
> john at miles.io writes:
>
> I've  always wanted to try baking the entire tube to vaporize any
> accumulations  of Cs metal outside the internal oven.  Is that what you
> did,
> Paul?  If some of the free cesium metal near the detector can be
> recondensed
> at the oven end, or just redistributed uniformly throughout the  tube, it
> might render a noisy tube usable again.
>
> The point at which  cesium vaporizes is 250C / 482F, and that seems like it
> could be survivable  unless there are thermoplastic structures or
> insulation
> sleeves inside the  tube for some reason.  The operation might be tricky,
> because while  you wouldn't want to heat the tube sufficiently to vaporize
> all of the  remaining cesium in the internal oven, you would also need to
> bake the tube  for quite some time to heat its internal structures
> uniformly,
> since it's  basically a vacuum bottle.  Outgassing from various internal
> materials  and structures would also be a concern.  Something to try with a
> tube  that is otherwise ready for the scrap heap...
>
> -- john, KE5FX
> Miles  Design LLC
>
> > -----Original Message-----
> > From:  time-nuts-bounces at febo.com [mailto:time-nuts-
> > bounces at febo.com] On  Behalf Of paul swed
> > Sent: Monday, September 23, 2013 12:52 PM
> >  To: Discussion of precise time and frequency measurement
> > Subject: Re:  [time-nuts] HP5061B Beam Tubes
> >
> > Tom
> > I added 10 degrees  and used the built in temp sensor in the tube as a
> > gauge. So its sort  of accurate to say 10 degrees. I remember evaluating
> the
> > temp  several ways.
> > I did not return it to original temp as I believed at  the time I was
> baking
> > out the last few Cs.
> > What your saying  in the threads very interesting. But don't have time to
> go
> > back and  adjust or reconnect the old oven controller. I would have to
> look
> > at  all of that again to see whats needed. I did this about 2 years ago
> its
> > in the time nuts archive I suspect.
> > Regards
> >  Paul.
>
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