• Country
• United States of America (USA)

• Manufacturer / Brand
• Northwestern Radio Mfg. Co.; Portland, OR

• Year
• 1921

• Category
• Radio module pre 1926 (not a part, not a key)

• Radiomuseum.org ID
• 221122

• Number of Tubes
• 1

• Valves / Tubes
• UV200

• Main principle
• Detector with Vacuum Tube (Valve), no tuner

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Detector Unit SR-3 - Northwestern Radio Mfg. Co.;

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Dimensions (WHD)
• 5.5 x 10.5 x 0 inch / 140 x 267 x 0 mm

• Notes
• Northwestern Radio Manufacturing Type SR-3 Detector Unit

• Price in first year of sale
• 20.00 USD

• Literature/Schematics (1)
• May 1921 Pacific Radio News magazine advertisement page 341

• Author
• Model page created by Alan Larsen. See "Data change" for further contributors.

• Other Models

• Here you find 17 models, 11 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Northwestern Radio Mfg. Co.; Portland, OR