• Country
• United States of America (USA)

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

• Year
• 1928

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 35674

• • alternative name: American Graphophone || Columbia Recording

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

• Number of Tubes
• 9

• Valves / Tubes
• 26 26 26 26 27 26 71A 80 81

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown)

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Broadcast only (MW).

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

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 10 inch = 25.4 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: C-4 - Columbia Phonograph, American

• Shape
• Console, Highboy (legs > 50 %).

• Dimensions (WHD)
• 23 x 47 x 16 inch / 584 x 1194 x 406 mm

• Notes

• One dial (primary tuning control knob) . Stretcher base.

  This model is manufactured by Brandes manufacturing for both Columbia and Kolster and uses the same two chassis as the Kolster model K-23.  It uses the C-4 Rectifier and reproducer unit which is the same as the Kolster K-23 reproducer shown on Riders Volume 1 page Kolster 1-2.

• Net weight (2.2 lb = 1 kg)
• 116 lb (116 lb 0 oz) / 52.664 kg

• Price in first year of sale
• 285.00 $

• External source of data
• Ernst Erb

• Source of data
• Radio Collector`s Guide 1921-1932

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

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Other Models

• Here you find 103 models, 69 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