On Tue, 2008-12-23 at 12:17 -0600, Dr. Gerald N. Johnson wrote:
> On Tue, 2008-12-23 at 09:05 -0800, Jeff wrote:
> >
> > Wanted Transformer close to 1500V @.750Ma
> >
> > Hello Folks I am looking for a transformer that is 120 volt primary and
> > around 1500 volts on secondary with at least .750Ma rating. I do not want
> > any microwave oven transformer’s… Also don’t want any expensive PW Dahl
> > type I simply can not afford them although I wish I could. I am retired
> > and on fixed income and I am trying my best to make home brew 6 meter amp
> > running a trio of 4CX250B tube’s And all I need is now to make the power
> > supply. Any help would be most appreciated.
> >
> > Any one having great schematics they would send of a power supply would be
> > great to.
> > Many thanks and Merry Christmas to all. Jeff
> >
>
> So you wish a DC supply that puts out about 2 KV at 3/4 amp DC? That's a
> lot of power on a 120 volt line, especially figuring the line current
> waveform won't be nice, but will be peaked from the capacitor input
> filter.
>
> Look for something like a Dentron MLA-2000 or 2500. It ran a pair of
> 8121 at about that voltage and current. New PA tubes are a serious
> expense so a used amp needing tubes tends to sell fairly cheaply.
>
> Look for a collection of control transformers with 600 volt and 480/240
> primaries. Run them backwards with the primaries in series to get 750 or
> so volts for a voltage doubler. What you save in transformers though
> will be eaten up in filter capacitors.
>
> Last I heard Dahl was retiring due to health problems and closing the
> business so that source may be totally gone, except used.
>
> 73, Jerry, K0CQ
>
Google showed me that P. W. Dahl is now a division of Harbach
Electronics and is still producing transformers.
73, Jerry, K0CQ
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