• Country
• Germany

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

• Year
• 1986 ?

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 250788

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - Is a Headphone or Earphone

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Stereo Headphone HD540 Reference - Sennheiser Electronic Labor W;

• Shape
• Portable set > 8 inch (also usable without mains)

• Notes

• 16-25 000 Hz, 300 Ohm.

• Net weight (2.2 lb = 1 kg)
• 0.250 kg / 0 lb 8.8 oz (0.551 lb)

• Mentioned in
• Funkschau (1/1986, S. 48 / Erfahrungsbericht)

• Author
• Model page created by Sándor Selyem-Tóth. See "Data change" for further contributors.

• Other Models

• Here you find 292 models, 277 with images and 133 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sennheiser Electronic (Labor W); Wennebostel