I have a collection of about 12 HP CS units, a mixture of 5061A's and 5061B's, 9 of which work, a couple of which I think might be able to be made to work and the others 'parts' units. I would love to get a spare CS tube or two to check these out.
I paid anywhere from about $300 to about $1500 for each of them on eBay and other sources and many required many hours of work to make functional, with much help from many on the list, Bert Kehren mostly but John Miles, Rick Karlquist, Corby Dawson and many others that I can't remember right now. You know, CRS (can't remember stuff). My apologies to those that have helped and I can't remember right now. For those not familiar, this is an AMAZING list of folks that are AMAZINGLY knowledgeable and helpful to us 'newbies'. Most have the standard HP CS tube but some have the high performance tube and some have the FTS tube. In general, those with the standard HP tube or the FTS tube have had the most Beam Current but not always. I confess they are 'addicting'. I, unfortunately, have been distracted by other projects, full time work, family, and other obligations and have not put them to their best use of precise measurement of time, frequency and phase but, eventually, I hope to do just that. I only have to learn the finer points of ADEV, phase noise, etc., and get one of those round TUIT's. I predict in about 2 to 8 years, I'll be 'retired' and have some spare time. Just depends on the economy. Could be in about 20 to 80 years. In any event, happy to help in any way I can. Joe -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tom Knox Sent: Friday, September 27, 2013 1:21 PM To: Time-Nuts Subject: Re: [time-nuts] CBT designation and usage? With a cesium standards cheap is truly relative since the remaining of tube life will make of break just about any deal regardless of price. Where it is hard to pay to much for a 5071A with a fresh tube. But I am curious also what others would consider cheap. Thomas Knox > Date: Fri, 27 Sep 2013 12:52:25 -0400 > From: [email protected] > To: [email protected] > Subject: Re: [time-nuts] CBT designation and usage? > > Cheap is relative. Curious what it means? > Paul > WB8TSL > > > On Fri, Sep 27, 2013 at 12:20 PM, mc235960 <[email protected]> wrote: > > > Hi, > > Some Qs for someone with 5071A experience. > > > > I have picked up a cheapo second hand 5071A and would like to know > > what tube I have and what remaining life I might expect. > > It locked in about 10-15 mins after I applied power for the first > > time this morning. > > > > the box s/n is 3249A00498 and the tube s/n 3124A00248 has an (S) suffix . > > There is an opt 001 (high performance CBT) label on the box. > > > > *idn? returns HEWLETT-PACKARD,5071A,0,X.3249 The Symmetricom manual of > > 2006 give a "SYMMETRICOM" string returned. So it must be quite old I > > guess. > > > > X.3429 appears to correspond to the firmware version as seen on the LCD . > > > > Given that, does anyone know how to find out > > > > a) date of manufacture > > b) type of CBT > > > > I could not find any command sequence to indicate usage, so is > > there a way to find out > > > > c) The cumulated CBT power on time? > > > > d) If that is not available, is there anything in Status summary > > that could give a clue to aging? > > > > scpi> syst:print? > > > > MJD 56562 15:20:21 > > CBT ID: 3124A00248(S) > > Status summary: Operating normally > > Power source: AC > > Log status: 15 entries > > > > Freq Offset: 0e-15 Osc. control: -5.57 % > > RF amplitude 1: 35.5 % RF amplitude 2: 33.4 % > > Zeeman Freq: 39949 Hz C-field curr: 12.157 mA > > E-multiplier: 1357 V Signal Gain: 14.4 % > > > > CBT Oven: 6.1 V CBT Oven Err: 0.02 C > > Osc. Oven: -9.0 V Ion Pump: 0.2 uA > > HW Ionizer: 1.1 V Mass spec: 11.0 V > > SAW Tuning: 1.9 V DRO Tuning: 5.7 V > > 87MHz PLL: 1.1 V uP Clock PLL: 2.7 V > > +12V supply: 12.4 V -12V supply: -12.3 V > > +5V supply: 5.5 V Thermometer: 42.3 C > > > > Regards, > > Mike > > > > > > > > > > > > > > > > > > _______________________________________________ > > 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. _______________________________________________ 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.
