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
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> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
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