Before Franklin M. Doolittle formed the Doolittle Radio Corporation and applied for a license for radio station WPAJ in New Haven, his company manufactured various types of radio equipment in the early 1920s.

The Amplifone was a loudspeaker that could be attached to a radio receiver. It was later altered and advertised as the Audimax in 1922.

Click for more on WDRC founder Franklin M. Doolittle.

closeup of the metal plate attached to a Doolittle Amplifone