[time-nuts] 5065's out there...

My two units: 848-00131Replaced Rb cavity all together with fresh electromechanics from  -00107 unit.Also replaced the AC Amplifier with later (improved) version copied from HP manual. 836-00107Scrapped since someone robbed it of the Quarz oscillator.The Rb cavity was used in -00131

[time-nuts] Selling Time and Frequency Equipment

TO ALL: FOR SALE HP 5065A late s/n 2816A01617. The unit has had the recommended caps replaced and is working great. I plan to send the unit to Corby for a plot and then it will be sold. The starting price is going to be $4000.00 not a penny less. Contact me off line from my e-mail below. I will

Re: [time-nuts] Selling Time and Frequency Equipment

On Sat, 24 Feb 2018 16:19:04 + MIKE ELDRIGE wrote: > The starting price is going to be $4000.00 not a penny less. https://www.ebay.com/itm/DATUM-Symmetricom-4040A-RS-11696-501-Cesium-Frequency-Standard-Atomic-Clock/112784315644

Re: [time-nuts] Selling Time and Frequency Equipment

Had coffee with a realtor friend yesterday who was trying to explain to a client: "It doesn't matter what you think it is worth. It doesn't matter what you say it is worth. What matters is what a buyer will pay you for it. The market, not the owner, decides the value of a piece of property. To

Re: [time-nuts] Selling Time and Frequency Equipment

That is correct Sent from my iPhone > On Feb 24, 2018, at 12:20 PM, William H. Fite wrote: > > Had coffee with a realtor friend yesterday who was trying to explain to a > client: "It doesn't matter what you think it is worth. It doesn't matter > what you say it is worth.

Re: [time-nuts] Curious, how many t-nuts have 5065A

> Hi > > Well, if anybody else is “giving away” 5065’s I’d certainly be willing to > “accept” > one :) > > Bob Be careful what you wish for. :) The unit Pete is talking about is a 1969-era model, in nice overall shape but with the usual bad capacitors on the oven controller board. The lamp

Re: [time-nuts] Curious, how many t-nuts have 5065A

There is one on UK ebay at the moment but its not being given away. From the one partial photograph it looks a bit rough. https://www.ebay.co.uk/itm/HP-5065A-Rubidium-Frequency-Standard/183057846558? Robert G8RPI. > > On 24 February 2018 at 10:02 John Miles wrote: > >

Re: [time-nuts] HP 5065A super

FRK is possible candidate we are looking at it add filter, reduce time constant Corby did but forgot to reduce filter  time constant. 5065A is 0.05 seconds.  We have to many projects low on the list Juerg is right now doing the new A9 for Corby If any body wants to seriously get involved

Re: [time-nuts] Curious, how many t-nuts have 5065A

It looks rough, there's a cesium standard for sale in the UK, time nuts member perhaps, that's sat at a quarter of the price, I know which I'd buy. On 24 Feb 2018 10:46, "George Atkinson via time-nuts" wrote: > There is one on UK ebay at the moment but its not being given

Re: [time-nuts] Curious, how many t-nuts have 5065A

Hi The “pickup only” part of the deal would be a bit of an issue for some of us :) Bob > On Feb 24, 2018, at 5:46 AM, George Atkinson via time-nuts > wrote: > > There is one on UK ebay at the moment but its not being given away. From the > one partial photograph it looks

Re: [time-nuts] Curious, how many t-nuts have 5065A

Old color and a little expensive only one partial pictureBert Kehren Sent from my Galaxy Tab® A Original message From: Bob kb8tq Date: 2/24/18 9:30 AM (GMT-05:00) To: George Atkinson , Discussion of precise time and frequency

[time-nuts] Selling Time and Frequency Equipment Or "just saying"

First, full disclosure, I have no vested or financial interest in the 5065A he is selling. Now the 2816A prefix is the last series built so the most modern. The last one I remember on eBay went for OVER $4000.00 Comparing a 5065A to a Cesium (except maybe a working 5071A for the same price)\is

Re: [time-nuts] Selling Time and Frequency Equipment Or "just saying"

Interesting, you have a data sheet and a picture of this wonder ? 73 de N1UL Sent from my iPhone > On Feb 24, 2018, at 5:14 PM, wrote: > > First, full disclosure, I have no vested or financial interest in the > 5065A he is selling. > > Now the 2816A

Re: [time-nuts] Selling Time and Frequency Equipment

> To echo Attila, just sayin. $4000 is up there, but not outrageous IMO. If you have a $4000 budget and don't actually need a primary standard, a well-kept 5065A is a good way to go. At taus less than a few hours they can outperform the best 5071As, even before Corby's mod is applied.

[time-nuts] Replacement A9 boards for the HP 5065A

Hi, I'm working to make some replacement A9 boards for the HP 5065A to the new style schematic. Will share the Gerber file when done. The integrator capacitor is a 1986 vintage TRW 5.0ufd 50V 10% .42"DX1.0"L axial. Of course it has an HP part number and no manufactures #. Any guess as to what

Re: [time-nuts] Replacement A9 boards for the HP 5065A

In message , cdel...@juno.com writes: >Any guess as to what type it is? > >Polycarbonate, polypropylene, ??? I think the manual says polypropylene in the parts list ? >Just wanting to find a good modern replacement for its use. (Integrator

Re: [time-nuts] Replacement A9 boards for the HP 5065A

Hi Teflon is the traditional “best of the best” for integrator caps. Simply finding any plastic cap (other than a motor start device) up around 5 uf is not that easy these days. As mentioned by PHK, being sure it is what it’s supposed to be …. good luck. Bob > On Feb 24, 2018, at 6:45

[time-nuts] Replacement A9 boards for the HP 5065A

For a while, all makers of polycarbonate caps got out of the business. The US government had to step in and get involved... apparently they are used in a lot of explody thingies, etc. Mouser shows one (around $7 for a 4.7 uF cap):

Re: [time-nuts] HP 5065A

Thanks for the note, Ulrich-Rohde, N1UL Sent from my iPhone > On Feb 24, 2018, at 8:59 PM, MIKE ELDRIGE wrote: > > TO ALL: > > HP 5065A IS sold. > Thank you, Mike > > -- Mike, KG7AT > mike.eldr...@msn.com > > >

Re: [time-nuts] Replacement A9 boards for the HP 5065A

Returning to the topic of what op-amp to use: Bert asked if the LT1793 is a good choice. I suggested the LT1012 as superior in the specific parameters that will provide best performance in the HP circuit (https://www.febo.com/pipermail/time-nuts/2018-February/108964.html). Attila suggested

Re: [time-nuts] Replacement A9 boards for the HP 5065A

Not too long ago I designed an integrator for a piezoelectric force transducer. The customer wanted a rock-solid output after a step load on the transducer. The capacitor of choice was PPS, used in surface mount form and less than 0.5uF total capacitance. With a particular PCB material chosen

[time-nuts] Replacement A9 boards for the HP 5065A

Well I hunted up the change pages for the A9. The cap is polycarbonate, the original A9 was polyester. If I can't find the polycarbonate I'll look into the PPS. Cheers, Corby ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Replacement A9 boards for the HP 5065A

Am 25.02.2018 um 00:45 schrieb cdel...@juno.com: Hi, I'm working to make some replacement A9 boards for the HP 5065A to the new style schematic. Will share the Gerber file when done. The integrator capacitor is a 1986 vintage TRW 5.0ufd 50V 10% .42"DX1.0"L axial. Of course it has an HP

[time-nuts] HP 5065A

TO ALL: HP 5065A IS sold. Thank you, Mike -- Mike, KG7AT mike.eldr...@msn.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] Replacement A9 boards for the HP 5065A

Corby A time constant is calculated from R and C. If 50 milliseconds is the correct number, R for 5 mfd is 10,000 ohms. You could use an aluminum electrolytic for the capacitor. Can you tell us where the 50 ms number came from? Regards, Bill Hawkins -Original Message- From:

Re: [time-nuts] Replacement A9 boards for the HP 5065A

The key properties relevant to long-TC integrator capacitors are insulation resistance (leakage) and dielectric absorption (DA). (One response on this thread opined that DA is not important in this circuit, but that is not correct. DA is most definitely a factor in long-TC integrators,