[BC] Re:111C repeat coils

[Xmitters@aol.com]

In a message dated 4/6/07 11:39:29 AM Central Daylight Time, 
broadcast-request at radiolists.net writes:

<< The telco 111-C "repeat coils" are available on the surplus market. They are
 probably the finest audio-frequency transformers --ever. They have four shield
ed coils and the core is a toriod made of mu-metal strip. Very impressive for s
omething designed in the 1920s. The companion shunt equalizers are also availab
le although I don't remember the number. They consist of a tapped inductor and 
tapped series resistors. Basically, you shunt-out >>

OK, here is a dumb question. If telco copper loops are still around and 111C 
and equalizers are not considered Old Fart Engineering (see  my previous 
post/coinage of term) then why are there not companies still making the 111C?  
As 
ROTL, et. al.  pointed out, Jenesn makes some nice transformers. It appears 
that the choice is either Jensen or surplus 111C. To me,  it is odd if equalize
d 
copper is still not antique technology today, that 111C type performance could 
not be had without resorting to the surplus market. Seems like you could 
outfit a specialty plant in China with some knowledgeable technicians, and you 
could turn out high quality affordable product. A new 111C made in the states 
would likely cost $500.00 I would guess. Just wondering.

The last I looked, the companion repeat coil card for the other end of a Tel 
Labs 4008 equalized circuit, was a bit anemic at the low end as well as anemic 
in the head room department. 

I'm sure that there are others out there besides me, that have restrictions 
about buying used stuff. What I do is, if used product is the only alternative,
 
I pay for it myself, then donate it to the station. I can only do that if the 
item costs but a few bucks. 


Jeff Glass
Northern Illinois University

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