[time-nuts] Re: 5061A HV Supply, et al. {External}
Lester Veenstra
m0ycm at veenstras.com
Tue Nov 15 14:46:33 UTC 2022
Not in my ovans. They run directly oiff od 50/60 Hz line. There is no RF freq flyback involved.
B>T>W> These would be useful with such a variac & transformer test supply.
<https://www.ebay.com/vod/FetchOrderDetails?itemId=402568223370&transactionId=1108957800027&mkevt=1&mkpid=0&emsid=e11401.m1842.l5920&mkcid=7&ch=osgood&euid=78ef2d648c414a41a24157fcd09254de&bu=43198945816&exe=102809&ext=241959&osub=-1%7E1&crd=20221115061028&segname=11401> US Stock 4pcs CL01-12 Microwave Oven High Voltage Diode Rectifier
<https://www.ebay.com/vod/FetchOrderDetails?itemId=402568223370&transactionId=1108957800027&mkevt=1&mkpid=0&emsid=e11401.m1842.l5919&mkcid=7&ch=osgood&euid=78ef2d648c414a41a24157fcd09254de&bu=43198945816&exe=102809&ext=241959&osub=-1%7E1&crd=20221115061028&segname=11401> US Stock 4pcs CL01-12 Microwave Oven High Voltage Diode Rectifier
Total: $7.47
Item ID: 402568223370
Lester B Veenstra K1YCM MÃYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
<mailto:lester at veenstras.com> lester at veenstras.com
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
From: paul swed [mailto:paulswedb at gmail.com]
Sent: Tuesday, November 15, 2022 8:37 AM
To: Discussion of precise time and frequency measurement
Cc: Andy Talbot; Lester Veenstra
Subject: Re: [time-nuts] Re: 5061A HV Supply, et al. {External}
In general purpose transformers 60 Hz is fine but the HV transformer is KHz as a heads up.
Paul
WB8TSL
On Mon, Nov 14, 2022 at 9:43 PM Lester Veenstra via time-nuts <time-nuts at lists.febo.com> wrote:
Of course a small âVariacâ on the primary will get the voltage to what you want
Lester B Veenstra K1YCM MÃYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
<mailto:lester at veenstras.com> lester at veenstras.com
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
From: Andy Talbot [mailto:andy.g4jnt at gmail.com]
Sent: Monday, November 14, 2022 3:44 PM
To: Lester Veenstra
Cc: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Re: 5061A HV Supply, et al. {External}
I've got three transformers going spare ... :-)
Andy G4JNT
IO90IV58AK12 (and others)
On Mon, 14 Nov 2022 at 20:40, Lester Veenstra <m0ycm at veenstras.com> wrote:
Sacrifice an old microwave oven to the Time Gods for its transformer
GPS: 39.336826 N 78.982287 W (Google) = FM09MI20DU01
GPS: 39.33682 N 78.9823741 W (GPSDO) = FM09MI20CU70
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
-----Original Message-----
From: Andy Talbot via time-nuts [mailto:time-nuts at lists.febo.com]
Sent: Monday, November 14, 2022 3:06 PM
To: Discussion of precise time and frequency measurement
Cc: Jim Muehlberg; Andy Talbot
Subject: [time-nuts] Re: 5061A HV Supply, et al. {External}
A simple flyback SMPSU with a Cockcroft-Walton tied on the end will give
you a simple high voltage supply. A chain of high value resistors and you
can even stabilise it.
Andy
www.g4jnt.com
On Mon, 14 Nov 2022 at 20:00, Jim Muehlberg via time-nuts <
time-nuts at lists.febo.com> wrote:
> Rodger,
>
> Thanks for the encouragement! I'm trying not to spend too much effort
> on this - sort of a distraction from real work. One would think that
> NRAO would have a HV power supply lying around somewhere, but astronomy
> has gone solid state now for decades! We have a grad student trying to
> nurse along another 5061 and we'd like to have a pair. I guess I'll
> slice open the A18 module and see what makes it tick.
>
> Thanks again,
>
> Jim
>
> On 11/10/2022 9:11 AM, Rodger via time-nuts wrote:
> > Hey Jim,
> >
> > I got a 5061a a couple years ago with high ION pump current. In my case
> the 3500 volts was there but the tube was not pumping down, even after
> being on for weeks. I found a Terranova 741 Ion pump power supply on eBay
> for under $100. It was listed as not working but worked AOK when I got
> it. It's a nice supply with variable output voltage, current limiting,
> safety interlocks, etc. I hooked it up to the tube and let it run for a
> few weeks. Tube pumped down successfully and is working AOK now. My
guess
> is that my A18 wasn't capable of supplying the current needed to pump down
> the tube but the external power supply was.
> >
> > Note: I proceeded very carefully with the external supply, letting it
> run for days at lower voltages and gradually working up to 3500. Also, I
> kept the current limit set as low as it would go. Anyway, it worked for
> me. Good luck with yours.
> >
> > Rodger
> >
> > -----Original Message-----
> > From: Jim Muehlberg via time-nuts <time-nuts at lists.febo.com>
> > Sent: Wednesday, November 9, 2022 11:07 AM
> > To: time-nuts at lists.febo.com
> > Cc: Jim Muehlberg <jmuehlbe at nrao.edu>
> > Subject: [time-nuts] 5061A HV Supply, et al.
> >
> > I've recently come into possession of a 5061A. It is claimed that the
> tube is exhausted, but I'm unwilling to scrap it (horrors!) yet. I'm not
> well equipped for HV measurements, but it appears the +3500 V supply is
not
> working. So, I'm hoping the tube just needs to be pumped since it hasn't
> been powered for years. Also missing the A3 assembly, but I'll worry
about
> that later...
> >
> > Anyone willing to part with their A18 or loan it to me?
> >
> > Thanks!
> >
> --
>
> Jim Muehlberg
> Senior Engineer
>
> National Radio Astronomy Observatory
> ngVLA Local Oscillator Lead
>
> 1180 Boxwood Estates Rd B-111
> Charlottesville, VA 22903-4602
> P 434.296.0270
> F 434.296.0324
> www.cv.nrao.edu/~jmuehlbe
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