[AMRadio] UTC LS-51


A.R.S. - W5AMI ars.w5ami at gmail.com
Tue Nov 21 12:53:44 EST 2006


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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>
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-- 
"There is nothing more uncommon than common sense." -- Frank Lloyd Wright



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