• Country
• United States of America (USA)

• Manufacturer / Brand
• Kennedy Co., Colin B.; San Francisco & St.Louis

• Year
• 1921

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 45417

• • alternative name: Colin B. Kennedy Corp.
  • Brand: Globe Trotter

• Number of Tubes
• 2

• Valves / Tubes
• UV201 or C301

• Main principle
• Audio-Amplification

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

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: 521 Amplifier - Kennedy Co., Colin B.; San

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

• Notes
• Matching the 281 Receiver.

• External source of data
• Ernst Erb

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

• Mentioned in
• Collector's Guide to Antique Radios 4. Edition

• Literature/Schematics (1)
• Vintage Radio 1887-1929, Greenwood's Classic Pictorial Album

• Other Models

• Here you find 145 models, 76 with images and 67 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Kennedy Co., Colin B.; San Francisco & St.Louis