• Country
• United States of America (USA)

• Manufacturer / Brand
• Pacific Radio Exchange; San Francisco, CA

• Year
• 1922

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 197151

• Number of Tubes
• 1

• Valves / Tubes
• UV201

• Main principle
• Audio-Amplification; 1 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

• from Radiomuseum.org
• Model: Paradex Audio Frequency Amplifier - Pacific Radio Exchange; San

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

• Notes
• Pacific Radio Exchange offered a line of little "box" sets that could be strung together to form a complete radio.

• Price in first year of sale
• 18.00 $

• Literature/Schematics (1)
• November 1922 Radio magazine page 40

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

• Other Models

• Here you find 7 models, 5 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Pacific Radio Exchange; San Francisco, CA