• Country
• United States of America (USA)

• Manufacturer / Brand
• Service Instruments, Inc.; New York

• Year
• 1930 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 55229

• from Radiomuseum.org
• Model: Simple Tube Tester - Service Instruments, Inc.; New

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Other Models

• Here you find 7 models, 5 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Service Instruments, Inc.; New York