• Country
• United States of America (USA)

• Manufacturer / Brand
• Radio Specialties Co.; San Francisco, California

• Year
• 1925

• Category
• Detector-Radio (Crystal or diode, without tubes/transistors)

• Radiomuseum.org ID
• 52690

• Main principle
• Crystal or Solid State Detector

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• No Power needed

• Loudspeaker
• - For headphones or amp.

• from Radiomuseum.org
• Model: Master M2 - Radio Specialties Co.; San

• Notes
• Three dials (primary tuning control knobs)

• Price in first year of sale
• 15.00 $

• 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 5 models, 1 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Specialties Co.; San Francisco, California