• Country
• Germany

• Manufacturer / Brand
• Grassmann, Peter, RFW, Radio-Funk-Werkstätten; vor 1945, Berlin & Neuhaldensleben

• Year
• 1939/1940

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 71900

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• Magnetic loudspeaker (reed) generic.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Helios 281 - Grassmann, Peter, RFW, Radio-

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 380 x 340 x 150 mm / 15 x 13.4 x 5.9 inch

• Notes
• Impedanz: 12 kOhm bei 800 Hz. Maximalbelastbarkeit 1 W.

• Net weight (2.2 lb = 1 kg)
• 2.4 kg / 5 lb 4.6 oz (5.286 lb)

• Price in first year of sale
• 24.00 RM

• Source of data
• Handbuch WDRG 1939 / Radiokatalog Band 2, Ernst Erb

• Author
• Model page created by Michael Seiffert. See "Data change" for further contributors.

• Other Models

• Here you find 111 models, 76 with images and 30 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Grassmann, Peter, RFW, Radio-Funk-Werkstätten; vor 1945, Berlin & Neuhaldensleben