• Country
• France

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

• Year
• 1925 ?

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

• Radiomuseum.org ID
• 119621

• • alternative name: SED

• Number of Tubes
• 1

• Valves / Tubes

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

• Wave bands
• Broadcast (MW) and Long Wave.

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios)

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case, TUBES VISIBLE.

• from Radiomuseum.org
• Model: Changeur de Fréquence JDM - Ducretet -Thomson; avant:

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

• Dimensions (WHD)
• 250 x 230 x 260 mm / 9.8 x 9.1 x 10.2 inch

• Notes

• Tube: Bigrille Ducretet

• Net weight (2.2 lb = 1 kg)
• 2 kg / 4 lb 6.5 oz (4.405 lb)

• Literature/Schematics (1)
• - - Manufacturers Literature (Notice No. 387)

• Literature/Schematics (2)
• Ducretet les années 20 (page 85)

• Literature/Schematics (3)
• Le Guide du Collectionneur TSF Biraud/Foster, Vol. I (page 156. figure 585)

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

• Other Models

• Here you find 655 models, 518 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