Soundmirror BK-401

• Country
• United States of America (USA)

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

• Year
• 1946

• Category
• Sound/Video Recorder and/or Player

• Radiomuseum.org ID
• 83632

• • alternative name: Brush Electronics

• Picture
• Schematics

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

• Number of Tubes
• 10

• Valves / Tubes
• 6SJ7 6SN7 6SJ7 6SN7 6E5 6SN7 6SN7 6SN7 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)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Soundmirror BK-401 - Brush Development Co. /

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 450 x 290 x 350 mm / 17.7 x 11.4 x 13.8 inch

• Notes
• The Soundmirror BK-401 is the second magnetic tape recorder-reproducer of the Brush Development Company. The operator instructions are mainly done by typewriting. The recording tape is made of paper. 3 motor drive !
  
  Features: 1/4" mono full-track reel-to-reel recorder/reproducer. 3", 5" and 7" EIA hub reels for 2-hour recording. 7 1/2 ips only. Reels made by 3M.
  
  Designed primarily for home-recording purposes. recordings may be made either from a crystal microphone, supplied with the unit, or from a phonograph pickup or the detector stage of a radio. The recording medium is coated-paper tape, marketed under the name of Magnetic Ribbon. Difficulties with slit tilt are avoided in the Soundmirror by using the same head for both recording and playback; a separate head, spaced about 1 inch from the recording head, is employed for erasing. During recording or playback the medium is held against the recording and erasing heads by felt pressure pads, which are automatically withdrawn when the "stop" switch is depressed. Any previous recording on the medium is automatically erased at the time a recording is made. Level is monitored during the recording period by means of a magic eye tube.

• Net weight (2.2 lb = 1 kg)
• 18.8 kg / 41 lb 6.6 oz (41.41 lb)

• Mentioned in
• Funkschau (Heft 6 März 1983 Walter Bruch)

• Literature/Schematics (4)
• Photofact Folder, Howard W. SAMS (Set 42, Date 7/48, Folder 4812-25)

• Documents regarding this model

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

• 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