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 <[email protected]> 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: [email protected] > > Date: Sun, 22 Sep 2013 23:57:43 -0700 > > From: [email protected] > > 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 > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
