• Country
• United States of America (USA)

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

• Year
• 1939 ?

• Category
• Microphone or Pick-up element

• Radiomuseum.org ID
• 306561

• Material
• Metal case

• from Radiomuseum.org
• Model: Uniplex Uni-Directional Crystal Microphone 730A - Shure; Chicago, Evanston,

• Dimensions (WHD)
• 3.1 x 3.1 x 3.3 inch / 79 x 79 x 84 mm

• Notes

• Frequency response:  30 - 10,000 Hz

  See later model 730S.

• Net weight (2.2 lb = 1 kg)
• 1 lb (1 lb 0 oz) / 0.454 kg

• Price in first year of sale
• 32.50 USD

• Literature/Schematics (1)
• - - Manufacturers Literature (Shure 1939 Catalog #152)

• Author
• Model page created by Pavek Museum. 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)