File:Vintage "The Famous Improved Kleer-Tone" Radio Module By Research Laboratories, Inc., Des Moines, Iowa, Stated Purpose Was To Improve Radio Reception, Circa 1920s (14314066553).jpg
DescriptionVintage "The Famous Improved Kleer-Tone" Radio Module By Research Laboratories, Inc., Des Moines, Iowa, Stated Purpose Was To Improve Radio Reception, Circa 1920s (14314066553).jpg
The "Kleer-tone" was a variable LC filter (wavetrap), to be inserted into antenna input network. It claimed to improve radio reception, if tuned correctly and if the dice falls right [1]. Check out this site to learn more about the Kleer-Tone: theradioboard.com/rb/viewtopic.php?t=2561
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