[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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