• Country
• Spain

• Manufacturer / Brand
• Optimus; Gerona

• Year
• 1944

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 151165

• • alternative name: Pla Hermanos y Cía

• Number of Tubes
• 1

• Valves / Tubes
• 80

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 125 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 30 cm = 11.8 inch

• Power out
• 30 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: 470-CA - Optimus; Gerona

• Notes
• Lleva una rectificadora para producir su propio campo.
  
  This loudspeaker carry a rectifier tube feeding its field coil.

• Literature/Schematics (1)
• Anuncio revista Radioelectricidad Febrero 1944

• Author
• Model page created by Miguel Bravo-Cos. See "Data change" for further contributors.

• Other Models

• Here you find 197 models, 134 with images and 98 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Optimus; Gerona