[time-nuts] Re: 5061A HV Supply, et al. {External}
Lester Veenstra
m0ycm at veenstras.com
Mon Nov 14 20:54:13 UTC 2022
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
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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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