• Country
• France

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

• Year
• 1922 ?

• Category
• RF (Radio Frequency-) Amplifier

• Radiomuseum.org ID
• 95014

• • alternative name: SED

• Number of Tubes
• 3

• Valves / Tubes
• TM TM TM

• Main principle
• Radio Frequency Amplification only

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 4 & 50 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Wooden case, TUBES VISIBLE.

• from Radiomuseum.org
• Model: HFM3 - Ducretet -Thomson; avant:

• Dimensions (WHD)
• 280 x 200 x 100 mm / 11 x 7.9 x 3.9 inch

• Notes
• Les dimensions de l'appareil sont données sans les lampes.

• Author
• Model page created by a member from F. See "Data change" for further contributors.

• Other Models

• Here you find 657 models, 523 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