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

[Dave ZL3FJ]

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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