Heath had them and B & W did also.  I have 2 of the B&W coil sets if 
anybody is interested.
Ralph Matheny
K8RYU
207 Gibbons Place
Marietta Ohio  45750
mathenyr@marietta.edu
On Sat, 26 Jul 2008, Jim WA9YSD wrote:
> I believe Heath Kit made a bifilar wound open air coil, and it use to match 
> 4:1, 50 to 300 or 75 to 450 ohms coil.  Thats before Ferrous type cores were 
> used for you young folk.  It was installed in series, at the output of the 
> TUBE transmitter, like a DX 60.  I do not remember the power rating of it.  I 
> use to have one.  Not sure if it had issues on 10 meters or not.  Coil was 
> about 8 inches long. about 2 or 3 inches in diameter. No capacitors, but its 
> been too long ago.
>
> Keep The Faith, Jim K9TF/WA9YSD
>
>
>
>
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