[time-nuts] HP5061B Beam Tubes

paul swed paulswedb at gmail.com
Mon Sep 23 14:29:06 EDT 2013


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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