• Country
• United States of America (USA)

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

• Year
• 1922 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 139603

• • Brand: Radak

• Number of Tubes
• 1

• Valves / Tubes

• Main principle
• Audio-Amplification

• Wave bands
• - without

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

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: H.R.A. - Clapp-Eastham Co.; Cambridge,

• Dimensions (WHD)
• 120 x 145 x 115 mm / 4.7 x 5.7 x 4.5 inch

• Notes
• Audio amplifier, single stage.

• Net weight (2.2 lb = 1 kg)
• 1.2 kg / 2 lb 10.3 oz (2.643 lb)

• Source of data
• - - Data from my own collection

• Author
• Model page created by Helmut Schrammel. See "Data change" for further contributors.

• 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