• Country
• Germany

• Manufacturer / Brand
• Koch & Sterzel AG; Dresden

• Year
• 1926/1927

• Category
• Radio module post 1925 (not a part, not a key)

• Radiomuseum.org ID
• 25568

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• No Power needed

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Sperrkreis Sp.K - Koch & Sterzel AG; Dresden

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Mentioned in
• Rundf. Empfg. Koch & S. VI 195,

• Other Models

• Here you find 75 models, 42 with images and 14 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Koch & Sterzel AG; Dresden