• Country
• United States of America (USA)

• Manufacturer / Brand
• Murdock, WM.J. Co.; Chelsea

• Year
• 1921

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 137091

• • alternative name: William J. Murdock Co.

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Material
• Various materials

• from Radiomuseum.org
• Model: 56A Headphone - Murdock, WM.J. Co.; Chelsea

• Notes
• Headphones (receivers), 2000 ohms. See also a 3000 ohm model 56B.

• Price in first year of sale
• 5.00 $

• Mentioned in
• Radio News 11/1922, p.879

• Literature/Schematics (1)
• The William B.Duck Catalog No.16

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

• Other Models

• Here you find 88 models, 70 with images and 6 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Murdock, WM.J. Co.; Chelsea