• Country
• United States of America (USA)

• Manufacturer / Brand
• Shure; Chicago, Evanston, Niles (IL)

• Year
• 1938 ??

• Category
• Microphone or Pick-up element

• Radiomuseum.org ID
• 133629

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Material
• Various materials

• from Radiomuseum.org
• Model: 720A - Shure; Chicago, Evanston,

• Notes
• Crystal microphone. Uni-, bi- or non-directional avaiable through a selector switch.

• Price in first year of sale
• 39.00 $

• Mentioned in
• The radio amateur's handbook 1938, cat. sec. p. 515

• Author
• Model page created by Otto Frosinn. See "Data change" for further contributors.

• Other Models

• Here you find 134 models, 129 with images and 51 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Shure; Chicago, Evanston, Niles (IL)