[time-nuts] HP5061B Beam Tubes

[paul swed]

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.


On Mon, Sep 23, 2013 at 2:58 PM, Tom Knox <actast at hotmail.com> wrote:

>
> Hi Paul;
> I have heard that it is not so much loss of Cesium, but the Cesium and
> contaminate mix sticking to the enclosure walls. The increased heat boils
> some of the gunk off.
> My question is what if you REALLY heat up the tube for a fairly short
> period? How much have you increased temp? and have you tried returning to
> original setting once it has locked again?
> Thomas Knox
>
>
>
> > Date: Mon, 23 Sep 2013 14:29:06 -0400
> > From: paulswedb at gmail.com
> > To: time-nuts at febo.com
> > Subject: Re: [time-nuts] HP5061B Beam Tubes
> >
> > Tom
> > As far as heating goes thats what I have done and it does work to an
> > extent. I still have very low beam. Thats what amazes me most is the darn
> > thing actually locks by itself.
> > So increasing the temperature is worth a try.
> > Regards
> > Paul.
> >
> >
> > On Mon, Sep 23, 2013 at 2:16 PM, Tom Knox <actast at hotmail.com> wrote:
> >
> > > Thanks Corby for adding the link, I should have provided the link in my
> > > earlier post.
> > > The shipping concern is because Cesium or Caesium metal is highly
> reactive
> > > and very pyrophoric. In addition to igniting spontaneously in air, it
> > > reacts explosively with water even at low temperatures, but the small
> > > amount of actual Cesium in a Cesium standard as well as the hardening
> > > provided by that tube structure were important factors in it's
> exemption. I
> > > have recieved and shipped Cesium standards both in the USA and
> > > internaionally using the DOT exemption with no problem. I have a hard
> case
> > > designed specifically for that purpose which came with a Datum 4065C
> but is
> > > also perfect for the 5071A. It has all the critical warning and
>  exemption
> > > information in metal labels riveted to the outside of the case. I have
> seen
> > > these cases on eBay from time to time. Be aware there is a limit of how
> > > many Cesium standard can be shipped at once under the exemption, I
> think it
> > > is five. Not really a factor for most of us.
> > > In any case I would use extreme caution if you ever open one for
> > > examination. To bad some industrious Time-Nut has not started a small
> > > business rebuilding Depleted Tubes. I have heard that failure often
> occurs
> > > when Cesium becomes mixed with contaminants and stuck to the enclosure
> > > walls, and there is a method to remove it. I know increasing the cell
> temp
> > > brings some standards back to life. And perhaps after heating and
> boiling
> > >  the Cesium off he walls the cleaner tube can then be returned to
> factory
> > > settings?
> > > I am sure a number of you have far more expertise and have experimented
> > > with these ideas to determine whether there is any truth to these tall
> > > tails. If so I am sure I am not the only one that would enjoy hearing
> what
> > > you know, perhaps on a new thread.
> > > Thanks;
> > > Thomas Knox
> > >
> > >
> > >
> > > > To: time-nuts at febo.com
> > > > Date: Sun, 22 Sep 2013 23:57:43 -0700
> > > > From: cdelect at juno.com
> > > > Subject: [time-nuts] HP5061B Beam Tubes
> > > >
> > > > Per the following Symmetricom instructions, HP/Agilent/Symmetricom
> tubes
> > > > or instruments with tubes are exempt from the Hazmat requirements if
> > > > shipped within the USA. You still have to label them per the
> instructions
> > > > and as stated you are considered "trained" If you understand the
> > > > instructions.
> > > >
> > > >
> > >
> http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp
> > > > ing_instructions.pdf
> > > >
> > > >
> > > > One other source for tubes for your 5060A/5061A/5061B (and 5062C
> with a
> > > > bit more mods) is to use FTS tubes removed from FTS 4050 and 4060
> units.
> > > > Some minor mechanical mods and you have to make adaptor cables but
> they
> > > > are simple to make.
> > > >
> > > > Corby
> > > >
> > > > _______________________________________________
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