• Country
• United States of America (USA)

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

• Year
• 1971–1981

• Category
• Amateur-Receiver (amateur bands, may include broadcast bands)

• Radiomuseum.org ID
• 87666

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Superhet, double/triple conversion; ZF/IF 54500/5000 kHz

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

• Power type and voltage
• Alternating Current supply (AC) / 117/234 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Metal case

• from Radiomuseum.org
• Model: HRO-600 - National Company; Cambridge &

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 432 x 133 x 394 mm / 17 x 5.2 x 15.5 inch

• Notes
• coverage 16 - 30000 kHz, AM, LSB/USB;
  motorized automatic preselector;
  standard 601 VFO with nixie tube frequency readout, optional 602 thumbwheel switch operated VFO or 603 four channel fixed frequency module;
  optional 620 noise blanker, 630 ISB converter, 650 FSK converter, 660 diversity module, 670 remote control;
  optional 610 DC power supply, rack kit

• Net weight (2.2 lb = 1 kg)
• 17.7 kg / 38 lb 15.8 oz (38.987 lb)

• Source of data
• Shortwave Receivers - Past & Present (3rd ed.)

• Author
• Model page created by Martin Bösch. See "Data change" for further contributors.

• Other Models

• Here you find 445 models, 284 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)