• Country
• Germany

• Manufacturer / Brand
• Koch & Sterzel AG; Dresden

• Year
• 1925–1927

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 15410

• Number of Tubes
• 9

• Valves / Tubes

• Main principle
• Superheterodyne (common)

• Tuned circuits
• 8 AM circuit(s)

• Wave bands
• Broadcast (MW) and Long Wave.

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

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: ER931 [var 1] - Koch & Sterzel AG; Dresden

• Notes
• 8Rö?=App aus [186-12] (Anz.Instr.!)??

• Price in first year of sale
• 740.00 RM

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

• Source of data
• Katalog Radiohaus Grüner 1925 / Radiokatalog Band 2, Ernst Erb

• Mentioned in
• Katalog Grüner 1926/27.

• Other Models

• Here you find 75 models, 49 with images and 25 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Koch & Sterzel AG; Dresden