[BC] 111C Repeat coils and Jensen replacements

[seaberg1@sbcglobal.net]

Russ and all the other transformer intelligentia on this list.

I have in my hands an assembly containing two HAMMOND
(made in Canada) transformers which show an apparent model
number MRI 3002.  I was told by a very respected engineer that
they were an equal or better substitute for the WE-111 transformer.
They certainly are smaller in physical size.
Your comments please.

Bob Seaberg -- W3MDM

----- Original Message ----- 
From: <RLO2L at aol.com>
To: <broadcast at radiolists.net>
Sent: Saturday, April 07, 2007 2:07 PM
Subject: [BC] 111C Repeat coils and Jensen replacements


>
> Gentlepeople:
>
> I am passing along a response to some of the comments about the 111C 
> repeat
> coils from my good friend Bill Whitlock who now runs Jensen transformers.
>
>
> Hi Russ,
>
> Jensen makes the following standard  (deliverable off-the-shelf) designs 
> that
> are functional equivalents of the  Western Electric 111C "repeat coils". 
> All
> have multiple internal Faraday  shielding, external magnetic shielding 
> cans,
> -3 dB bandwidth extending from well  under 1 Hz to at least 200 kHz, and
> extremely low harmonic distortion. The three  models vary in package and 
> level
> handling ability - remember that level-handling  for a transformer must 
> specify
> frequency and that, for the same THD, level  handling always decreases 
> with
> frequency. The single-piece, end-user prices  are $133, $137, and $196, 
> respectiv
> ely. OEM and quantity pricing (which begins  at quantity 4) are 
> considerably
> lower. These "repeat coil" designs, which  combine the properties of input
> transformers (Faraday shielding) and output  transformers (ability to 
> drive long
> cables/capacitive loads) are widely  used for patchbay applications. The
> following are links to our data sheets.
> _http://www.jensentransformers.com/datashts/11ssp6m.pdf_ 
> (http://www.jensentransformers.com/datashts/11ssp6m.pdf)
> _http://www.jensentransformers.com/datashts/11ssp7mp.pdf_
> (http://www.jensentransformers.com/datashts/11ssp7mp.pdf)
> _http://www.jensentransformers.com/datashts/11ssp8ma.pdf_
> (http://www.jensentransformers.com/datashts/11ssp8ma.pdf)
> Numerous application notes and quantity  pricing are also available at our
> website.  Don't hesitate to contact me with technical questions.
>
> [Russ, feel free to post this on the list if  you like - and thanks for
> passing on the post. Happy holidays!]
>
> Cordially,
> Bill Whitlock,  president & chief engineer
> Jensen Transformers,  Inc.
> (from my home  office)
>
> Best,
>
>
>
>
> Russel L.  O'Toole, P.C.
> R&M Consulting
>
> 31 Ponderosa  Drive
> Romeoville, Illinois 60446
> 815-372-1990 voice
> 630-699-2965  cell
> 815-886-9232 fax
> KD5OAE General
>
>
>
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