• Country
• United States of America (USA)

• Manufacturer / Brand
• Radio Development Company; San Francisco

• Year
• 1920

• Category
• Radio module pre 1926 (not a part, not a key)

• Radiomuseum.org ID
• 221166

• Number of Tubes
• 3

• Valves / Tubes
• VT-Class-I or B_Moorhead-Shaw VT-Class-II or A_Moorhead VT-Class-II or A_Moorhead

• Main principle
• Detector with Vacuum Tube (Valve), no tuner; 2 AF stage(s)

• Wave bands
• - without

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

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

• Material
• Wooden case, TUBES VISIBLE.

• from Radiomuseum.org
• Model: Detector & Two-Step Audio Amplifier - Radio Development Company; San

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Notes
• Radio Development Company Detector and Two-Stage Audio Amplifier.

• Price in first year of sale
• 38.00 $

• Literature/Schematics (1)
• August 1920 Pacific Radio News magazine advertisement page 15

• Author
• Model page created by Alan Larsen. See "Data change" for further contributors.

• Other Models

• Here you find 3 models, 3 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Development Company; San Francisco