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, <ewkeh...@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, > j...@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-boun...@febo.com [mailto:time-nuts- > > boun...@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. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.