• Country
• Germany

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

• Year
• 1935–1940

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 14857

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

• Number of Tubes
• 3

• Valves / Tubes
• RES964 RES964 RGN2504 or RGN2004

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Loudspeaker + integr.Amplifier

• Power type and voltage
• Alternating Current supply (AC) / 110; 125; 150; 220; 240 Volt

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

• Power out
• 7 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: Helios-Grossraum-Tonsender Fafner 7b - Grassmann, Peter, RFW, Radio-

• Dimensions (WHD)
• 410 x 380 x 310 mm / 16.1 x 15 x 12.2 inch

• Notes
• Gegentakt-Endstufe kombiniert mit Lautsprecher.

• Net weight (2.2 lb = 1 kg)
• 27 kg / 59 lb 7.5 oz (59.471 lb)

• Price in first year of sale
• 440.00 RM !

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

• Source of data
• Katalog Radio-Zentrale Alex v. Prohaska 1935/1936 / Radiokatalog Band 2, Ernst Erb

• Circuit diagram reference
• Röhren in FS-Bestückungstabellen

• Literature/Schematics (1)
• -- Original prospect or advert

• 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