• Country
• United States of America (USA)

• Manufacturer / Brand
• Ellis Electrical Laboratory Sales Corp.; Chicago, IL

• Year
• 1930 ??

• Category
• Microphone or Pick-up element

• Radiomuseum.org ID
• 321604

Click on the schematic thumbnail to request the schematic as a free document.

• Wave bands
• - without

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Double Button Carbon Microphone 20 - Ellis Electrical Laboratory

• Dimensions (WHD)
• 170 x 360 x 45 mm / 6.7 x 14.2 x 1.8 inch

• Notes

• Double Button Carbon Microphone

• Net weight (2.2 lb = 1 kg)
• 0.8 kg / 1 lb 12.2 oz (1.762 lb)

• Author
• Model page created by a member from D. See "Data change" for further contributors.

• Other Models

• Here you find 2 models, 2 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Ellis Electrical Laboratory Sales Corp.; Chicago, IL