• Country
• United States of America (USA)

• Manufacturer / Brand
• Freed-Eisemann Radio Corp.; New York, NY

• Year
• 1927

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 40984

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 1

• Valves / Tubes
• CX380 or UX280

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 115 Volt

• Material
• Metal case

• from Radiomuseum.org
• Model: NR457 Power Unit - Freed-Eisemann Radio Corp.;

• Shape
• Chassis only or for «building in»

• Notes
• Power unit for model NR57.

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Other Models

• Here you find 205 models, 106 with images and 128 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Freed-Eisemann Radio Corp.; New York, NY