• Country
• United States of America (USA)

• Manufacturer / Brand
• Gulbransen Co.; Chicago

• Year
• 1930

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 43764

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

• Number of Tubes
• 5

• Valves / Tubes
• 24 24 12A or UX201A 12A or UX201A 12A or 71A

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown); Screengrid 1926-1935

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries / 6 & 90 & 135 or 180 & -9 & -8,5 or -25 or -38 Volt

• Material
• Wooden case

• from Radiomuseum.org
• Model: 53 [Batt.] - Gulbransen Co.; Chicago

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

• Notes
• One dial (primary tuning control knob);
  final tube 12A : B= 135V, C= -8.5V
  final tube 71A : B= 135V, C= -25V or B= 180V, C= -38V

• Price in first year of sale
• 99.00 $

• External source of data
• Ernst Erb

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

• Circuit diagram reference
• Rider's Perpetual, Volume 3 = 1933 and before

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

• Other Models

• Here you find 64 models, 10 with images and 31 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Gulbransen Co.; Chicago