• Country
• United States of America (USA)

• Manufacturer / Brand
• National Company; Cambridge & Malden (MA)

• Year
• 1934/1935

• Category
• Amateur TRX: Transmitter/Receiver (and Transceiver)

• Radiomuseum.org ID
• 286208

• • alternative name: National Toy Co.
  • Brand: Thrillbox

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

• Number of Tubes
• 2

• Valves / Tubes
• 30 33

• Main principle
• Transceiver

• Wave bands
• VHF incl. FM and/or UHF (see notes for details)

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Transceiver TR 56 Type TRW [TRM] - National Company; Cambridge &

• Shape
• Portable set > 8 inch (also usable without mains)

• Notes

• The National TR 56 (TRW) Transceiver is a portable unit, operating on the 56 MHz band. The receiver portion is superregenerative. It is housed in an oak cabinet.

  The TRM version comes housed in a metal cabinet ($45 US).

• Price in first year of sale
• 67.50 USD

• Mentioned in
• National Catalog No. 240 - 1934

• Author
• Model page created by Wayne Childress. See "Data change" for further contributors.

• Other Models

• Here you find 446 models, 285 with images and 189 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from National Company; Cambridge & Malden (MA)