• Country
• United States of America (USA)

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

• Year
• 1952 ??

• Category
• Commercial Receiver (may include amateur bands)

• Radiomuseum.org ID
• 90075

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

• Main principle
• Superhet, double/triple conversion

• Wave bands
• Broadcast, Long Wave and more than two Short Wave bands.

• Power type and voltage
• Alternating Current supply (AC)

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 8 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: URR-39 / R-651 - National Company; Cambridge &

• Shape
• Rack

• Dimensions (WHD)
• 483 x 267 x 445 mm / 19 x 10.5 x 17.5 inch

• Notes
• coverage VLF and 540 kHz - 31 MHz, AM, CW (BFO);
  double conversion on frequencies above 4 MHz;
  militarized version of NC-183DR, VLF instead of 6m ham band, 0-200 logging scale instead of bandspread in ham bands

• Source of data
• Communications Receivers

• Author
• Model page created by Martin Bösch. 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)