• Country
• United States of America (USA)

• Manufacturer / Brand
• Ballantine Laboratories Inc.; Boonton, New Jersey

• Year
• 1942

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 138860

• Wave bands
• - without

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

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Decade Amplifier 220 - Ballantine Laboratories Inc.;

• Shape
• Portable set > 8 inch (also usable without mains)

• Notes
• ×10 and ×100 amplifier, 10 to 100.000 Hz bandwidth. Increases the sensitivity of model 300 AC voltmeter down to 30 µV.

• Literature/Schematics (1)
• Advertised as 'new' in Electronics, Feb. 1942

• Author
• Model page created by Emilio Ciardiello. See "Data change" for further contributors.

• Other Models

• Here you find 15 models, 10 with images and 9 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Ballantine Laboratories Inc.; Boonton, New Jersey