• Country
• Denmark

• Manufacturer / Brand
• Brüel & Kjær; Nærum

• Year
• 1965 ??

• Category
• Miscellaneous (Other, Various) - see notes

• Radiomuseum.org ID
• 125947

• Number of Transistors
• 2

• Semiconductors
• OC75 OC76

• Power type and voltage
• Powered by external power supply or a main unit. / 24 Volt

• Material
• Metal case

• from Radiomuseum.org
• Model: Response Test Unit 4409 - Brüel & Kjær; Nærum

• Dimensions (WHD)
• 250 x 75 x 180 mm / 9.8 x 3 x 7.1 inch

• Notes
• A test unit and test recording for accurate investigations of the frequency response of stereophonic sound reproducing equipment.

• Net weight (2.2 lb = 1 kg)
• 2 kg / 4 lb 6.5 oz (4.405 lb)

• Source of data
• - - Data from my own collection

• Mentioned in
• - - Manufacturers Literature

• Author
• Model page created by Vaclav Skricka. See "Data change" for further contributors.

• Other Models

• Here you find 63 models, 61 with images and 16 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Brüel & Kjær; Nærum