• 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
• 14865

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

• Number of Tubes
• 1

• Valves / Tubes
• RGN2004

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 110; 125; 150; 220 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 38 cm = 15 inch

• Material
• Metal case

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

• Shape
• Chassis only or for «building in»

• Notes

• Erreger 30W. Eingebauter vielfach unterteilter Anpassungstransformator hoch- und niederohmig.

  Belastbar bis 20 W (ohne Verzerrung laut Anbieter).

• Net weight (2.2 lb = 1 kg)
• 16.1 kg / 35 lb 7.4 oz (35.463 lb)

• Price in first year of sale
• 250.00 RM

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• HandB.d.d.Rundfunk-Handels 1936/37 / Radiokatalog Band 2, Ernst Erb

• Circuit diagram reference
• Röhren in FS-Bestückungstabellen

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

• 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