Carl`s right about the older transformers...They were designed for choke
input supplys and high voltage/low current tubes of that era,and probably
with a current rating of 300-400ma. The best money spent(IMO) for modern
capacitor input supplys would be a Peter Dahl transformer.Or,if you don`t
mind a giant trans...Try a pole pig...I ran my old 4-1000`s for years with
one and it never even broke a sweat. All 250lbs of it...Jim, K7RDX..
----- Original Message -----
From: "jeremy-ca" <km1h@jeremy.mv.com>
To: "Bill Otten" <harpman54@tampabay.rr.com>; <amps@contesting.com>
Sent: Tuesday, May 08, 2007 5:04 PM
Subject: Re: [Amps] Transformer question...
> Those oldies were made for tube rectifier and choke input filtering. Size
> would indicate something in the 400-500 ma range at ~2500 or 3000 VDC, I
> dont have quick access to my old UTC catalogs to confirm.
> When used with the typical FW bridge and capacitor filter the regulation
> suffers quite a bit due to the internal xfmr impedence and your peak amps
> would be half if youre trying for the full secondary output.. The 115V
> primary doesnt help either and would require a minimum of #10 wiring if
more
> than a dozen feet from the feed panel.
>
> Been there done that years ago and with a 4-1000A. Finally rebuilt that
amp
> for Class C AM and did it the old way, Heavy and Loud!
>
> Carl
> KM1H
>
>
>
> ----- Original Message -----
> From: "Bill Otten" <harpman54@tampabay.rr.com>
> To: <amps@contesting.com>
> Sent: Tuesday, May 08, 2007 7:23 PM
> Subject: [Amps] Transformer question...
>
>
> > Hi, I'm new to the group and just learning a great deal reading through
> > the archives of this list. One question I have: I was given a United
> > Transformer model S50 (called the special series in the only reference I
> > could find online...a 1962-63 catalog). The S50 listed there isn't the
> > same as the one I have. THAT one was listed as 115volt primary with
> > secondaries of 3000-2500-0-2500-3000.
> >
> > The one I have has the two 115 volt primary taps and a center tap, but
> > there are 2 connections on top marked 5000volts and two more marked 6000
> > volts. I haven't a clue what the DC amperage rating might be on this
amp,
> > nor do I have any clue as to whether it would power an RF deck. I think
my
> > concern would be the pull on a 115 volt circuit to run 6000 volts out.
> > Size is about 10" high by 9" wide by 7" deep. Plenty heavy.
> >
> > Bottom line: I'd appreciate any insight into this transformer and
whether
> > it would supply an amp somehow. It tests fine. 10 volts in and about
> > 470volts out on the 5000v taps. I can't recall the results of the
6000volt
> > taps but they were a bit higher than the 5000 volt taps.
> >
> > I have the RF deck already complete...a very nice 4-1000A, just got to
> > deal with getting a power supply to fire it up.
> >
> > Thanks!
> >
> > Bill
> > KC9CS
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
>
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