• Country
• Germany

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

• Year
• 1936/1937

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 111191

• Wave bands
• - without

• Power type and voltage
• Direct Current supply (DC) / 220 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Helios 681Gl. - Grassmann, Peter, RFW, Radio-

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 410 x 530 x 270 mm / 16.1 x 20.9 x 10.6 inch

• Notes
• Schwingspulen-Impedanz: 3,5 Ohm; Maximalbelastbarkeit: 10 W.

• Net weight (2.2 lb = 1 kg)
• 12 kg / 26 lb 6.9 oz (26.432 lb)

• Price in first year of sale
• 98.00 RM

• Source of data
• HandB.d.d.Rundfunk-Handels 1936/37

• Author
• Model page created by Bernd P. Kieck. 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