Early Television As Auxillary For Radio

The August 1939 issue of Popular Mechanics, posted on Modern Mechanix, included this little item about a television receiver that used an AC radio as a speaker.  According to the article, the TV plugged into the radio set "in the same manner that you would connect a record player."  Funny story.  I bought an old, 1940's era floor radio in the Summer of 2010, and it had a button labelled "Phono/Tele" for just such a purpose.  Here is the funny part.  The connection for that 1940's era phonograph or television is the same RCA/phono connector used today on many modern audio/TV systems.  Result:  I can listen to my downloaded swing music using my MP3 player, a cheap connector cable, and this old radio.  No modifications necessary.  Priceless.