• Country
• France

• Manufacturer / Brand
• Radio-Opéra, Guillain & Cie; Paris

• Year
• 1924/1925

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 258440

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• from Radiomuseum.org
• Model: Auto-transformateur - Radio-Opéra, Guillain & Cie;

• Shape
• Chassis only or for «building in»

• Notes

• Auto-transformateur pour très petites ondes.

• Price in first year of sale
• 30.00 FRF

• Mentioned in
• La Science et la vie, No. 90, Dec. 1924

• Other Models

• Here you find 48 models, 6 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio-Opéra, Guillain & Cie; Paris