Re: [TenTec] Transformer and schematic help needed

["Roger Hughes" <roger.h@comcast.net>]

HI gerald. Old heathkit SB23b. I can't remember model. for transformer. Also 
the SB-200 heath amp can be easilly  converted to 6m Amp. My friend did one, 
but I have no idea. He got the mod off the web.Each one if those should be 
cheap. They may be worth a check. 73 Roger.
----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
To: <tentec@contesting.com>
Sent: Tuesday, December 23, 2008 12:17 PM
Subject: Re: [TenTec] Transformer and schematic help needed


> 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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