• Country
• Germany

• Manufacturer / Brand
• Tefag; Telephon Aktiengesellschaft vorm. J. Berliner

• Year
• 1926/1927

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 4867

• • alternative name: Telephon-Fabrik, AG vorm. J. Berliner

• Number of Tubes
• 3

• Valves / Tubes

• Main principle
• Audio-Amplification

• Wave bands
• - without

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

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: NF-Verstärker [3 Rö.] - Tefag; Telephon

• Notes
• End-Röhren im Gegentakt.

• Source of data
• Radiokatalog Band 1, Ernst Erb

• Circuit diagram reference
• Info Dr. H. Börner without schematic

• Other Models

• Here you find 262 models, 180 with images and 108 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Tefag; Telephon Aktiengesellschaft vorm. J. Berliner