• Country
• United States of America (USA)

• Manufacturer / Brand
• Sterling Manuf. Co.; Cleveland, Ohio

• Year
• 1927 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 156485

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

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries / 6 & 22.5 - 45 Volt

• Material
• Metal case

• from Radiomuseum.org
• Model: R-407 [Vacuum Tube Tester] - Sterling Manuf. Co.; Cleveland

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 215 x 165 x 75 mm / 8.5 x 6.5 x 3 inch

• Notes
• Professional Tube Tester for 4 prong UV and UX based tubes (also WD-11, WD-12). The TAG ID is mounted upside down (original) on the front panel. We can read on the TAG ID the following information: - Marathon Tubes For Distance Northern Manufacturing Co Newark New Jersey. - Sterling R 407 Vacuum Tube Tester Made by The Sterling MFG Co. The indication "The Sterling MFG. CO. Cleveland, Ohio USA" is mentioned on the meters "Filament Volts" (FSD:8) and "Plate Milliamperes" (FSD:10).

• Net weight (2.2 lb = 1 kg)
• 1.250 kg / 2 lb 12.1 oz (2.753 lb)

• Circuit diagram reference
• Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)

• Mentioned in
• Rider's 2-1

• Other Models

• Here you find 60 models, 37 with images and 31 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sterling Manuf. Co.; Cleveland, Ohio