[time-nuts] Re: 5061A HV Supply, et al.

[paul swed]

300 ua is way more then enough.

On Fri, Nov 11, 2022 at 1:17 PM Dave ZL3FJ via time-nuts <
time-nuts at lists.febo.com> wrote:

> If one was to build an external 3500 volt supply for this purpose, what
> sort
> of current does it need to be able to deliver?
> DaveB, NZ
>
> -----Original Message-----
> From: Rodger via time-nuts [mailto:time-nuts at lists.febo.com]
> Sent: Friday, November 11, 2022 03:12
> To: 'Discussion of precise time and frequency measurement'
> Cc: 'Jim Muehlberg'; rodger_adams at yahoo.com
> Subject: [time-nuts] Re: 5061A HV Supply, et al.
>
> 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
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