• Country
• United States of America (USA)

• Manufacturer / Brand
• Gulbransen Co.; Chicago

• Year
• 1930/1931 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 285459

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

• Number of Tubes
• 7

• Valves / Tubes
• 24 24 24 27 45 45 80

• Main principle
• TRF without regeneration; 2 AF stage(s); Screengrid 1926-1935

• Tuned circuits
• 3 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)

• Material
• Wooden case

• from Radiomuseum.org
• Model: 73 Champion Junior - Gulbransen Co.; Chicago

• Shape
• Console, Lowboy (legs < 50 %).

• Dimensions (WHD)
• 24.5 x 40 x 14.5 inch / 622 x 1016 x 368 mm

• Notes

• Same chassis as Wells-Gardner model 72.

• Price in first year of sale
• 94.50 USD

• Mentioned in
• Radio Retailing (Radio & Television R.) (Sept. 1930, pg. 103)

• Literature/Schematics (1)
• The Cunningham Radiotron Manual RC-12 RCA (Pages 1240 - 1242)

• Literature/Schematics (2)
• Rider's Perpetual, Volume 1 = 1931/1934 (1919 to 1931) (Early Version pages 392-A, B, C)

• Author
• Model page created by Terry Rohler. See "Data change" for further contributors.

• 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