• Country
• Germany

• Manufacturer / Brand
• Fernfunk, Gesellschaft für drahtlose Telefonie mbH; Berlin

• Year
• 1927–1929

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 14521

• • Brand: GRB, Ges. für Radiobedarf mbH

• Number of Tubes
• 1

• Valves / Tubes

• Main principle
• Audio-Amplification

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case, TUBES VISIBLE.

• from Radiomuseum.org
• Model: NF-Verstärker M3 - Fernfunk, Gesellschaft für

• Price in first year of sale
• 26.00 RM +

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

• Source of data
• Katalog Radio-Zentrale Prohaska 1928 / Radiokatalog Band 2, Ernst Erb

• Mentioned in
• Radio-Diehr, Berlin, 1928/1929

• Other Models

• Here you find 66 models, 41 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Fernfunk, Gesellschaft für drahtlose Telefonie mbH; Berlin