• Country
• Germany

• Manufacturer / Brand
• Sennheiser Electronic (Labor W); Wennebostel

• Year
• 1975–1980

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 127704

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Wave bands
• - without

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 2,3-2,6 Volt

• Loudspeaker
• - Is a Headphone or Earphone

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Infrarot-Kinnbügelhörer HDI406 - Sennheiser Electronic Labor W;

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Notes
• Empfang über Infrarotlicht mit Schalter und Lautstärkesteller, Trägerfrequenz 95 kHz, Modulation FM, Frequenzgang 100 bis 10000 Hz, Übertragungsbereich 50 bis 8000 Hz.

• Net weight (2.2 lb = 1 kg)
• 0.1 kg / 0 lb 3.5 oz (0.22 lb)

• Price in first year of sale
• 160.00 DM

• Mentioned in
• -- Original-techn. papers. (1979/1980)

• Literature/Schematics (1)
• Funkschau (18/1975, S. 72)

• Author
• Model page created by Karlheinz Fischer. See "Data change" for further contributors.

• Other Models

• Here you find 295 models, 280 with images and 135 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sennheiser Electronic (Labor W); Wennebostel