[GreenKeys] wire pipes...

[Randy or Sherry Guttery]

Randy or Sherry Guttery wrote:
> Has anyone replaced the wire pipes on a model 28 keyboard (the ones that 
> carry the signal lines between the keyboard contact box and the filter 
> module)? 

I'd like to thank everyone for some excellent suggestions on this part 
of "the project".

Thanks to Steve Schlink - I now know where to find what appears to be 
the right size and type of copper (refrigeration capillary tubing). It's 
a bit small - but with modern wire sizes - should be able to make it 
work (you'd also have to "tin" it - but that's not difficult).

I went with a different option, though - one that is fairly quick and 
the wire is readily available here (and probably most places) - and 
that's RG-174.  Page five of "the project" details the steps for both 
rebuilding the line filter - and replacing the pipes.

I was a bit surprised the line filter was bad - until I got into it and 
found plain-old paper caps.  Makes me wonder how many bad filters there 
are "out there". Or did Teletype start using better quality parts in 
later (and/or) military units? I also did a "Hmmmm" when I found the 
diode across that coil was open.  Since the coil is OK - I have to 
believe the junction "just failed" as opposed to being "blown" by a 
spike or such.

Again - Thanks for the many suggestions... .

best regards to all
-- 
randy guttery

A Tender Tale - a page dedicated to those Ships and Crews
so vital to the United States Silent Service:
http://tendertale.com