• Country
• United States of America (USA)

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

• Year
• 1950 ??

• Category
• Sound/Video Recorder and/or Player

• Radiomuseum.org ID
• 34811

• • alternative name: Brush Electronics

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

• Number of Tubes
• 7

• Valves / Tubes
• 6J7 6SJ7 6J5 6SL7GT 6E5 6SN7 5Y3

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Tape Recorder

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

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

• from Radiomuseum.org
• Model: Soundmirror BK-411 - Brush Development Co. /

• Notes
• The model Soundmirror BK-411 is also for home recording like the BK-401 Soundmirror. The BK-411 is probably the first commercial magnetic recorder that stops when only a few turns of tape are left on the supply reel and then automatically rewinds the tape.

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 22, covering 1951

• Other Models

• Here you find 43 models, 39 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. / Clevite Electronic Components; Cleveland, Ohio