• Country
• Germany

• Manufacturer / Brand
• Stahlwerk Mark AG; Berlin-Breslau

• Year
• 1925

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 17057

• Number of Tubes
• 4

• Valves / Tubes

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown); 1 Special; 2 AF stage(s); Neutrodyne

• Tuned circuits
• 2 AM circuit(s)

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

• Loudspeaker
• - For headphones or amp.

• from Radiomuseum.org
• Model: Neutrodyn 4-Rö - Stahlwerk Mark AG; Berlin-

• Notes
• 4-Röhren-Neutrodyn-Luxusempfänger; Mahagoni mit verschliessbaren Türen

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

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Mentioned in
• Historische Radios Band IV (72)

• Other Models

• Here you find 16 models, 4 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Stahlwerk Mark AG; Berlin-Breslau