• Country
• Germany

• Manufacturer / Brand
• Schneider-Opel AG, Radiowerke; Frankfurt a.M., später Berlin

• Year
• 1928/1929

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 16933

• • Brand: Mars

• Number of Tubes
• 4

• Valves / Tubes

• Power type and voltage
• Alternating Current supply (AC)

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: 4 Rö - Schneider-Opel AG, Radiowerke;

• Notes
• NF-Verstärker; 3 Bed. El.

• Price in first year of sale
• 250.00 RM +

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

• Source of data
• Radio Schnorr 1929 / Radiokatalog Band 2, Ernst Erb

• Other Models

• Here you find 133 models, 92 with images and 20 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Schneider-Opel AG, Radiowerke; Frankfurt a.M., später Berlin