• Country
• United States of America (USA)

• Manufacturer / Brand
• Bell Sound Systems; Columbus (OH)

• Year
• 1947

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 128906

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

• Number of Tubes
• 2

• Valves / Tubes
• 1S5 3Q4

• Main principle
• Audio-Amplification

• Wave bands
• - without

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

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Belfone 440L - Bell Sound Systems; Columbus

• Shape
• Tablemodel, with any shape - general.

• Notes
• The Bell Sound model Belfone 440L and Belfone 440S are AC-DC operated inercommunication systems. Normally a model 440L (with more station switches) and model 440S work together, sometimes also with substations with a call switch. See photo from SAMS.

• Mentioned in
• Radio Retailing (Radio & Television R.) (May 1947 page 165.)

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Date 9-47, set 25, folder 4715-9)

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

• Other Models

• Here you find 115 models, 111 with images and 70 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Bell Sound Systems; Columbus (OH)