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
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