• Country
• United States of America (USA)

• Manufacturer / Brand
• Columbia Phonograph, American / Volta Graphophone Company; USA

• Year
• 1930 ??

• Category
• Sound/Video Recorder and/or Player

• Radiomuseum.org ID
• 35641

• • alternative name: American Graphophone || Columbia Recording

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

• Number of Tubes
• 4

• Valves / Tubes
• 27 45 45 80

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Record Player (perh.Changer)

• Power type and voltage
• Alternating Current supply (AC) / 100-110; 110-120 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• from Radiomuseum.org
• Model: 930 - Columbia Phonograph, American

• Notes
• Push-pull af output stage.

• External source of data
• Ernst Erb

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

• Literature/Schematics (1)
• Rider's Perpetual, Volume 3 = 1933 and before

• Other Models

• Here you find 118 models, 84 with images and 34 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Columbia Phonograph, American / Volta Graphophone Company; USA