[AMRadio] UTC LS-51


Mike Dorworth, K4XM k4xm at arczip.com
Tue Nov 21 13:00:08 EST 2006


Sorry just went page to page entire book.1957 catalog
. The most resisitance on the secondary would be the 500/600 and half of
that would be the 125 ohm ----- Original Message ----- 
From: "A.R.S. - W5AMI" <ars.w5ami at gmail.com>
To: "Mike Dorworth, K4XM" <k4xm at arczip.com>; "Discussion of AM Radio in
the Amateur Service" <amradio at mailman.qth.net>
Sent: Tuesday, November 21, 2006 12:53 PM
Subject: Re: [AMRadio] UTC LS-51


> Mike,
>
> Any pin connection info on this?
>
> Tnx
> Brian
>
> On 11/21/06, Mike Dorworth, K4XM <k4xm at arczip.com> wrote:
> > LS-51 push pull low level plates to multiple line
> >
> > primary impedance 30000 plate to plate. secondary 50,
> > 125,150,200,250,333,500/600 ohms plus/minus 1 db from 10 to 40000
hz.
> > Max level +24, relative hum -74 db unbal dc in primary ONE ma.
> >
> >
> > ----- Original Message -----
> > From: "A.R.S. - W5AMI" <ars.w5ami at gmail.com>
> > To: "Discussion of AM Radio in the Amateur Service"
> > <amradio at mailman.qth.net>
> > Sent: Tuesday, November 21, 2006 12:37 PM
> > Subject: [AMRadio] UTC LS-51
> >
> >
> > > I need a little help with this transformer.  It is a UTC LS-51 in
my
> > > 1937 speech amp.  The output tubes are a pair of 56's in push pull
> > > connected to pins 7 and 10, and the output is line level at I'm
> > > assuming around 500 ohms balanced using pins 1 and 6.
> > >
> > > Does anyone have a diagram of this transformer with specs on the
pins?
> > >  I think I may have a some shorted turn on one side of the
primary, as
> > > my audio p-p voltage shows one side about half of the other, but I
> > > just want to make sure the thing is connected right first.  I
tried
> > > swapping the 56's, but the same side showed a reduced audio
voltage.
> > >
> > > tnx
> > > Brian / w5ami
> > >
> > > --
> > > "There is nothing more uncommon than common sense." -- Frank Lloyd
> > Wright
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>
>
> -- 
> "There is nothing more uncommon than common sense." -- Frank Lloyd
Wright
> ______________________________________________________________
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