• Country
• United States of America (USA)

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

• Year
• 1931

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 49617

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

• Number of Tubes
• 3

• Valves / Tubes
• 24 24 27

• Main principle
• TRF with regeneration; Screengrid 1926-1935

• Wave bands
• Broadcast and Short Wave (SW).

• Power type and voltage
• Alternating Current supply (AC) / 2,5 / 135-180 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Thrill Box SW-3 - National Company; Cambridge &

• Shape
• Tablemodel, with any shape - general.

• Notes
• low budget version following the SW-5 series receivers and omitting the audio output stage for budget reasons;
  headphones operation only, optional DWG audio amplifier;
  covers 90 - 35000 kHz with plug-in coils, coils numbered 10 - 22, earliest coil sets color coded
  operation with different power sources and tube sets, see variants;
  different improved model versions followed and production continued into the post war years

• External source of data
• Ernst Erb

• Source of data
• Radio Collector`s Guide 1921-1932

• 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)