• Country
• Austria

• Manufacturer / Brand
• Zerdik; Wien

• Year
• 1932/1933

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

• Radiomuseum.org ID
• 11029

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• from Radiomuseum.org
• Model: Wellenventil - Zerdik; Wien

• Notes
• Differential-Wellenventil

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

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Mentioned in
• Funktechnischer Vorwärts (3209)

• Other Models

• Here you find 166 models, 115 with images and 76 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Zerdik; Wien