Jeff Duntemann's Technology Projects  
TL
Three examples of plug-in coils for homebrew shortwave receivers. The two on the left are made from vitamin bottles with bases from defunct octal tubes. (Note that the center one has not yet been wound.) The one on the right is a commercial Bakelite form, though I don't know where it was originally sold.
BB

Three examples of plug-in coils for homebrew shortwave receivers. The two on the left are made from vitamin bottles with bases from defunct octal tubes. (Note that the center one has not yet been wound.) The one on the right is a commercial Bakelite form, though I don't know where it was originally sold.


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