• Country
• Norway

• Manufacturer / Brand
• Ostfold Radio A/S; Frederikstad

• Year
• 1949/1950

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 71724

• Number of Tubes
• 4

• Valves / Tubes
• DK40 DF21 DAF91 DL92

• Main principle
• Superheterodyne (common)

• Wave bands
• Broadcast, Long Wave and 2 x Short Wave.

• Power type and voltage
• Dry Batteries / 90/1,5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 10 cm = 3.9 inch

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: Knuppen 491 - Ostfold Radio A/S;

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

• Dimensions (WHD)
• 310 x 250 x 160 mm / 12.2 x 9.8 x 6.3 inch

• Price in first year of sale
• 302.00 NKr.

• Author
• Model page created by Ernst Rykkje. See "Data change" for further contributors.

• Other Models

• Here you find 38 models, 26 with images and 7 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Ostfold Radio A/S; Frederikstad