[Amps] Transformer question...
wc6w_amps at yahoo.com
Fri May 11 11:27:33 EDT 2007
I have several UTC catalogs from 1956 through 1964
and they all list the S-50 as having a center tapped
I used to have a couple of parts from that family
myself back in the 2nd millennium. I gave one of
them to a friend who was building an amp with a pair
of 4CX250's. It was just about right for that
The S-50 weighs right around 50 pounds. Unless
your's weighs condsiderably more, I'd doubt your
supposition that you have a unit good for 300mA across
the full secondary.
Now, I'll engage in a bit of guessing...
Maybe in the dark distant past the center tap
terminal was somehow removed?
Perhaps a version was made with the center tap
connected the case?
73 & Good morning,
--- Bill Otten <harpman54 at tampabay.rr.com> wrote:
> Hi Marv,
> This particular transformer doesn't have a secondary
> center tap --
> just the primary does (115 volts). The secondary(s)
> are two posts
> marked 5000v and two more marked 6000v.
> The best I could find for a transformer from United
> listed as a Special
> Series Model S50 was for one with a 115v primary and
> secondaries of
> 2350 volts and 3000 volts, roughly 1/2 of the
> transformer I've got. That
> particular transformer had a 300mA capacity, I'd
> have to guess mine is
> twice that based on the increased secondaries.
> Regardless, I now think I'm on the hunt for a plate
> transformer capable
> of driving this 4-1000A amp. Something about
> 4500-6000 volts on the
> secondary and with 220 primary.
> Anyone got one they want to part with???
> ....by the way, thanks to Carl, KM1H and Jim, K7RDX
> for their advice on this
> ----- Original Message -----
> From: "Radio WC6W" <wc6w_amps at yahoo.com>
> To: "Bill Otten" <harpman54 at tampabay.rr.com>;
> <amps at contesting.com>
> Sent: Wednesday, May 09, 2007 12:26 PM
> Subject: Re: [Amps] Transformer question...
> > Hi Bill,
> > That transformer is designed to be operated with
> > secondary center tap grounded.
> > It is not insulated for full wave bridge
> > And it's only good for about 1KW. Hardly enough
> > wake up a 4-1000A
> > 73 & Good morning,
> > Marv WC6W
> > http://wc6w.50webs.com/
> > --- Bill Otten <harpman54 at tampabay.rr.com> wrote:
> >> Hi, I'm new to the group and just learning a
> >> deal reading through the archives of this list.
> >> 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
> >> 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
> >> a center tap, but there are 2 connections on
> >> marked 5000volts and two more marked 6000 volts.
> >> haven't a clue what the DC amperage rating might
> >> on this amp, nor do I have any clue as to whether
> >> would power an RF deck. I think my concern would
> >> the pull on a 115 volt circuit to run 6000 volts
> >> out. Size is about 10" high by 9" wide by 7"
> >> 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
> >> 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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