• Country
• France

• Manufacturer / Brand
• Ducretet (-Thomson; avant: Fernand Ducretet et Ernest Roger etc.); Paris

• Year
• 1927

• Category
• Pre-stage (adaptor for SW/FM/VHF/UHF incl. built-in), Frequency converter

• Radiomuseum.org ID
• 111399

• • alternative name: SED

• Number of Tubes
• 1

• Valves / Tubes
• R43

• Main principle
• RF Converter/Adapter (not voltage converter)

• Power type and voltage
• Storage and/or dry batteries / 4 & 25 & 40 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Modèle spécial Changeur de fréquence - Ducretet -Thomson; avant:

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

• Dimensions (WHD)
• 245 x 120 x 160 mm / 9.6 x 4.7 x 6.3 inch

• Notes
• Successor of CF1 , but also covering SW down to 10 meters.
  Official name: Modèle spécial pour réception de très courtes longeurs d'onde (jusqu'à 10 mètres). 1 Bigrille. Price does not include bigrille.

• Net weight (2.2 lb = 1 kg)
• 2.3 kg / 5 lb 1.1 oz (5.066 lb)

• Price in first year of sale
• 650.00 FFr

• Source of data
• -- Original prospect or advert

• Mentioned in
• Le grand livre de la TSF (TSF Ref.20495)

• Author
• Model page created by John Koster. See "Data change" for further contributors.

• Other Models

• Here you find 657 models, 522 with images and 286 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Ducretet (-Thomson; avant: Fernand Ducretet et Ernest Roger etc.); Paris