• Country
• Germany

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

• Year
• 1937/1938

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 75651

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Wooden case

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

• Shape
• Tablemodel, high profile (upright - NOT Cathedral nor decorative).

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

• Notes
• Tischlautsprecher im Holzgehäuse mit Universal-Anpassungstrafo 500/4000/15000 Ohm; Spulenimpedanz 3,5 Ohm. Maximalbelastbarkeit: 10 W.

• Net weight (2.2 lb = 1 kg)
• 9.5 kg / 20 lb 14.8 oz (20.925 lb)

• Price in first year of sale
• 128.00 RM

• Source of data
• Handbuch WDRG 1938 / 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