• Country
• United States of America (USA)

• Manufacturer / Brand
• Radio Devices Co.; San Francisco. California

• Year
• 1923

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 52443

• Number of Tubes
• 2

• Valves / Tubes

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - This model requires external speaker(s).

• from Radiomuseum.org
• Model: Audio Unit [old] - Radio Devices Co.; San

• Shape
• Tablemodel, with any shape - general.

• Price in first year of sale
• 45.00 $

• Source of data
• Radio Collector`s Guide 1921-1932

• Author
• Model page created by Peter Rutishauser. See "Data change" for further contributors.

• Other Models

• Here you find 4 models, 0 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Devices Co.; San Francisco. California