• Country
• Germany

• Manufacturer / Brand
• Grassmann, Peter, RFW, Radio-Funk-Werkstätten; vor 1945, Berlin & Neuhaldensleben

• Year
• 1931

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 244109

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

• Power type and voltage
• Direct Current supply (DC) / 220 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 26.7 cm = 10.5 inch

• Material
• Metal case

• from Radiomuseum.org
• Model: Helios Dynamus 48 - Grassmann, Peter, RFW, Radio-

• Dimensions (WHD)
• 267 x 285 x 132 mm / 10.5 x 11.2 x 5.2 inch

• Notes

• Schwingspule ca. 3,5 Ω
  Erregerspule ca. 600 Ω

  Ausführungen als Chassis oder im Gehäuse.

  Es gab eine Wechsel- und Gleichstromausführung.

   

• Price in first year of sale
• 48.00 RM

• Mentioned in
• Die Sendung Nr.20 Mai 1931

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

• Other Models

• Here you find 111 models, 76 with images and 30 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Grassmann, Peter, RFW, Radio-Funk-Werkstätten; vor 1945, Berlin & Neuhaldensleben