• Country
• Germany

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

• Year
• 1932/1933

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 156291

• Wave bands
• - without

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 22 cm = 8.7 inch

• Material
• Metal case

• from Radiomuseum.org
• Model: Permanent-Magnet-Dynamik PMD [Chassis] - Hegra, Hekra, Marke, Hermann

• Shape
• Chassis only or for «building in»

• Notes
• Chassis PMD für den Gehäuselautsprecher PMG 1.

• Price in first year of sale
• 36.00 RM

• Literature/Schematics (1)
• Katalog Radio-Zentrale Prohaska 1928 (1932/33, Nr.A607)

• Author
• Model page created by Konrad Birkner † 12.08.2014. 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