• Country
• United States of America (USA)

• Manufacturer / Brand
• Challenger Amplifier Co. (Bogen); New York, NY / Paramus, NJ

• Year
• 1948/1949

• Category
• Miscellaneous (Other, Various) - see notes

• Radiomuseum.org ID
• 132414

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

• Number of Tubes
• 2

• Valves / Tubes
• 12SL7GT 50L6GT

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• AC/DC-set / 110-120 Volt

• Loudspeaker
• 2 Loudspeakers / Ø 3.375 inch = 8.6 cm

• Material
• Bakelite or Plastics (type unknown)

• from Radiomuseum.org
• Model: Intercommunication System 20R + 200 - Challenger Amplifier Co. Bogen

• Shape
• Tablemodel without push buttons, Mantel/Midget/Compact up to 14

• Notes
• The two models 20R (master) and 200 (slave) are together an AC-DC operated intercommunication system made by Challenger Amplifier Co. The 12SL7GT functions as AF amplifier plus rectifier and the 50L6GT as power output tube. The slave has only a "break in switch".

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Date 9-49, 4917-5, set 69, folder 5)

• Author
• Model page created by Ernst Erb. See "Data change" for further contributors.

• Other Models

• Here you find 47 models, 43 with images and 35 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Challenger Amplifier Co. (Bogen); New York, NY / Paramus, NJ