• Country
• United States of America (USA)

• Manufacturer / Brand
• National Radio Institute (NRI); Washington, DC

• Year
• 1948 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 158846

• Number of Tubes
• 6

• Valves / Tubes
• 6BA6 6BA6 6SQ7 6K6G 6E5 5Y3G

• Main principle
• Superhet with RF-stage; ZF/IF 455 kHz

• Wave bands
• Broadcast plus more than 2 Short Wave bands.

• Power type and voltage
• Alternating Current supply (AC) / 110-120 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Material
• Metal case

• from Radiomuseum.org
• Model: Signal Tracer Professional 34 - National Radio Institute NRI;

• Shape
• Tablemodel, with any shape - general.

• Notes
• This signal tracer has a complete AM 4 band radio circuit incorporated.

• Author
• Model page created by Meyer Rochwerger. See "Data change" for further contributors.

• Other Models

• Here you find 20 models, 20 with images and 8 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from National Radio Institute (NRI); Washington, DC