• Country
• United States of America (USA)

• Manufacturer / Brand
• Camfield Radio Mfg. Co., Oakland, CA

• Year
• 1925

• Category
• Kit (Parts plus instruction) or building instructions only

• Radiomuseum.org ID
• 34962

• Number of Tubes
• 5

• Valves / Tubes

• Main principle
• TRF without regeneration

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - This model requires external speaker(s).

• from Radiomuseum.org
• Model: Duodyne circuit - Camfield Radio Mfg. Co.,

• Notes
• 5 tube Duodyne using 3 Duoformer 22 and Straightline Condensers. For the new power tubes CX220 or UX120 and CX112 or UX112. Complete booklet "The Duodyne Circuit" available for 25c.

• External source of data
• Ernst Erb

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

• Literature/Schematics (1)
• Radio News, Nov.1925, p.733

• Other Models

• Here you find 6 models, 5 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Camfield Radio Mfg. Co., Oakland, CA