• Country
• United States of America (USA)

• Manufacturer / Brand
• Brush Development Co.; Cleveland, Ohio

• Year
• 1948 ??

• Category
• Sound/Video Recorder and/or Player

• Radiomuseum.org ID
• 129444

• • alternative name: Brush Electronics

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Other Recorder/Player

• Power type and voltage
• Alternating Current supply (AC) / 60 Hz; 110 - 120 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• from Radiomuseum.org
• Model: Mail-A-Voice BK-501 - Brush Development Co.;

• Notes
• The model BK-501 Mail-A-Voice from "The Brush Development Company" is intended primarily for correspondence and dispenses with the solenoid of the BK-503.

• Author
• Model page created by Ernst Erb. See "Data change" for further contributors.

• Other Models

• Here you find 42 models, 38 with images and 22 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Brush Development Co.; Cleveland, Ohio