Re: [time-nuts] Fwd: HP5061B High Ion Current/Tubes Out of Cesium
Don't forget Skips great hi-res pixs. Those pictures actually triggered a complete re-thinking for me about how C tubes actually work. Further digging and reading that set me straight. I think Poul-Henning helped me also. I doubt there are fumes in a 004. But a low flux tube there may be hope. Regards Paul WB8TSL On Fri, Apr 7, 2017 at 4:33 PM, Poul-Henning Kamp wrote: > > In message gmail.com> > , "Donald E. Pauly" writes: > > >I think that a website should be started with the collected wisdom of > >this list. > > I've been advocating a time-nuts wiki for some time, but I don't have > time to run it myself. > > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > ___ > 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.
Re: [time-nuts] Fwd: HP5061B High Ion Current/Tubes Out of Cesium
In message , "Donald E. Pauly" writes: >I think that a website should be started with the collected wisdom of >this list. I've been advocating a time-nuts wiki for some time, but I don't have time to run it myself. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] Fwd: HP5061B High Ion Current/Tubes Out of Cesium
https://www.febo.com/pipermail/time-nuts/2017-April/thread.html We did not attempt to achieve lock because we saw absolutely no beam current with the beam adjust all the way up. We were running the oven above 150° C which is more than 65° above normal oven temperatures. Cesium pressure should have been about 30 times normal. A photo of the A11 Cesium controller board is posted at http://gonascent.com/papers/hp/hp5061/photos/cesiheat.jpg taken by KB7APQ. Note that there are no electrolytics but tantulums installed instead. They must have been very costly 30 years ago. This also prevents hard to find problems with high ESR electrolytics with age. We have found open 47 μFd electrolytics inside two of our four HV power supplies. That is a place for tantalums if there ever was one. We are working on our HP5061B's from 500 miles apart so photographs of boards and waveforms help greatly. The cesium oven servo is underdamped. It overshoots and rings down at a 10 second time interval during temperature steps. You can see the R12 that we shorted out to get 150° oven temperatures for troubleshooting our suspected bad tube. I think that a website should be started with the collected wisdom of this list. I will host it if someone will maintain it. Corby's photo graphs of dismantled beam tube parts should be on a nice web page. If anyone has a high ion current 05061-6077 beam tube that they can part with please contact me. One of our beam tubes is completely out of cesium. πθ°μΩω±√·Γλ WB0KVV -- Forwarded message -- From: paul swed Date: Thu, Apr 6, 2017 at 5:09 PM Subject: Re: [time-nuts] HP5061B High Ion Current/Tubes Out of Cesium To: Discussion of precise time and frequency measurement Donald running higher temperatures on a a normal tube may indeed give you a bit more life. Thats exactly how Frankenstein works. Its a hand me down tube that normally showed as dead. Believe me it doesn't even move the current meter and its working. My firm belief is that option 004 tubes do not have anything left to give. But yet with the higher temp (10-15 higher as I recall) it locks all on its own after a good warmup period. Serious fumes. Its been operating this way for some 4 years now. I don't run it all of the time and I actually recently found what was wrong that always gave it a slight offset. So a very good conversation running here with everyone sharing really good insights and pictures of detail I had only read about and generally without any pictures. The entire thread should be gathered up, cleaned up, and presented as the dummys guide to the care and feeding of old 5061s. 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.
