• Country
• Germany

• Manufacturer / Brand
• Hegra, Hekra, (Marke), Hermann Grau, Berlin-Friedrichshagen - Vorkrieg

• Year
• 1931

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 182899

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

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Metal case

• from Radiomuseum.org
• Model: Lautsprecher-Chassis Form MD - Hegra, Hekra, Marke, Hermann

• Shape
• Miscellaneous shapes - described under notes.

• Notes
• Magnet-Dynamik-Chassis ohne Erregung für eine Ausgangsleistung bis 4 Watt.

• Author
• Model page created by Museum Roggenhofer. See "Data change" for further contributors.

• Other Models

• Here you find 117 models, 99 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hegra, Hekra, (Marke), Hermann Grau, Berlin-Friedrichshagen - Vorkrieg