[AMRadio] UTC LS-51


A.R.S. - W5AMI ars.w5ami at gmail.com
Wed Nov 22 01:15:05 EST 2006


Thanks guys.  I got the tap information from W5JO (thanks Jim!).


On 11/21/06, Mike Dorworth, K4XM <k4xm at arczip.com> wrote:
> 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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-- 
"There is nothing more uncommon than common sense." -- Frank Lloyd Wright



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