• Country
• Germany

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

• Year
• 1933–1940

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 165214

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

• Wave bands
• - without

• Power type and voltage
• Direct Current supply (DC)

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Material
• Metal case

• from Radiomuseum.org
• Model: Helios-Dynamos Mammut G - Grassmann, Peter, RFW, Radio-

• Shape
• Chassis only or for «building in»

• Notes

• Gleichstromausführung, für jede normale Spannung lieferbar.
  Erreger 30W. Eingebauter vielfach unterteilter Anpassungstransformator hoch- und niederohmig.

  Bis 20 W belastbar (ohne Verzerrung laut Anbieter).

• Price in first year of sale
• 200.00 RM

• Mentioned in
• Katalog Ch.Mank, Leipzig (undatiert, nach ~1934)

• Literature/Schematics (1)
• Reyersbach AG, Liste 482, Okt.1933

• Author
• Model page created by Georg Richter. 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