• Country
• United States of America (USA)

• Manufacturer / Brand
• Koss Corporation; Milwaukee, WI

• Year
• 1970 ?

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 157393

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

• Wave bands
• - without

• Power type and voltage
• Powered by external power supply or a main unit.

• from Radiomuseum.org
• Model: Stereo Headphones ESP-9 - Koss Corporation; Milwaukee,

• Notes
• Electrostatic stereo headphones; 15 to 15000Hz, 80dB SPL, 4 to 16 ohms. Fluid filled earcups.
  The high voltage bias was generated by an external power unit. Suitable for very critical studio monitoring.

• Price in first year of sale
• 150.00 $

• Source of data
• -- Original-techn. papers.

• Author
• Model page created by Emilio Ciardiello. See "Data change" for further contributors.

• Other Models

• Here you find 51 models, 50 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Koss Corporation; Milwaukee, WI