[time-nuts] 4 KV Power Supply Recommendations

John Miles jmiles at pop.net
Sun Jan 17 22:34:28 UTC 2010


True, which is unfortunate -- when I was shopping for mine, there were at
least a half-dozen known-good HV modules selling at less than $100, coming
from a couple of different vendors.

You're right, though, in that you don't get above 1 mA without dropping more
cash.  The only >1 mA supply I have is a Glassman 15 mA model that was
somewhat more expensive (and quite a bit more expensive by the time I bought
the manual and cable from Glassman.)  That's the supply I used to restore my
5062C tube earlier, with Corby's help.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of J. Forster
> Sent: Sunday, January 17, 2010 2:04 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 4 KV Power Supply Recommendations
>
>
> I just looked at eBay and most everything suitable is well over $200.
>
> -John
>
> ============
>
>
> > The small Bertan modules in particular are extremely stable and
> > well-behaved.  You get exactly the voltage that you program, accurate to
> > within about a tenth of a percent.  No spikes, no drift, and no
> obnoxious
> > AF
> > whine like you get from the HP modules.
> >
> > The smaller ones are good for 500 uA, and the larger modules
> are good for
> > 2-5 mA depending on model.
> >
> > -- john, KE5FX
> >
> >> -----Original Message-----
> >> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> >> Behalf Of J. Forster
> >> Sent: Sunday, January 17, 2010 8:00 AM
> >> To: Discussion of precise time and frequency measurement
> >> Subject: Re: [time-nuts] 4 KV Power Supply Recommendations
> >>
> >>
> >> The small modules are nice, but many PMT supplies do not go to 5 mA. 5
> >> mA
> >> @ 4 KV is 20 Watts output, more at the input. That's a lot for a PMT
> >> supply.
> >>
> >> Also, remember that some supplies designed for gas lasers have a HV
> >> "kick"
> >> at startup that may go to 20-30 KV.
> >>
> >> -John
> >>
> >> ==============
> >>
> >>
> >> >
> >> >> Since it appears to be making some progress, I'd be tempted to just
> >> >> continue. The pump rate of an ion pump varies with the
> current, so it
> >> >> seems you are pumping, just somewhat more slowly than w/
> the external
> >> >> supply, as long as you are not overloading the internal supply.
> >> >>
> >> >> If you don't have a lab supply, get an old transformer from some
> >> vaccum
> >> >> tube gear and use the HV secondary to drive a Cockroft-Walton
> >> multiplier
> >> >> to get to what you want. Pretty trivial to build these days. Put the
> >> >> primary on a Variac to adjust the voltage.
> >> >>
> >> >> BTW, a commercial supply at that voltage and current is
> going to cost
> >> >> several hundred dollars.
> >> >
> >> > The nicer Glassman rack-mounted supplies are spendy, but smaller HV
> >> > modules
> >> > for PMT and laser work are common and inexpensive.  Go to eBay
> >> and search
> >> > for "<manufacturer> supply", where common manufacturers include Emco,
> >> > Bertan, Spellman, Fluke, and Glassman.  E.g. item 220539685243 .
> >> These
> >> > smaller modules tend to sell for well under $100, and are handy to
> >> have
> >> > around.
> >> >
> >> > -- john, KE5FX
> >>
> >>
> >>
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>
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