• Country
• United States of America (USA)

• Manufacturer / Brand
• Clapp-Eastham Co.; Cambridge, MA

• Year
• 1923

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 35287

• • Brand: Radak

• Number of Tubes
• 2

• Valves / Tubes

• Main principle
• Audio-Amplification; 2 AF stage(s)

• Power type and voltage
• Dry Batteries

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Radak A4 [.] - Clapp-Eastham Co.; Cambridge,

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

• Notes
• more than one box matching amp. for the A4, to drive a horn speaker.

• Price in first year of sale
• 25.00 $

• External source of data
• Ernst Erb

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

• Mentioned in
• Radio Manufacturers of the 1920s, Vol 1

• Other Models

• Here you find 130 models, 106 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Clapp-Eastham Co.; Cambridge, MA