[Boatanchors] Plug in coils

Al Klase ark at ar88.net
Fri Jul 19 12:15:49 EDT 2013


Hello Preston,

I believe plug-in coils came about in the mid-1920's with the move to 
shortwaves (HF).  The earliest example I can cite is the RCA AR-1496 
TRF-autodyne receiver which covered 4 shortwave bands from about 3.5 to 
24 MHz.  The coils are mounted horizontally on rectangles of Bakelite 
that hold pin jacks to engage pin plugs in the radio.

There's a long homebrew tradition of gluing cylindrical things to 
discarded tube bases, or using just a tall tube base for higher frequencies.

Oops.  Found one a year earlier.  Grebe CR-18.  See: 
http://www.stonevintageradio.com/description.php?II=61&UID=20130719091421

Al

On 7/19/2013 10:22 AM, Preston Clark wrote:
> Hello group I am reading surviving technology  and I have seen on eBay the coils of certain bands that plug into the radio. I am curious when did these start and how hard are they to make from scratch  73 Preston kf5evv
> Sent from my iPhone
> ______________________________________________________________
>

-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/



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