• 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
• 49616

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

• Number of Tubes
• 3

• Valves / Tubes
• 24 24 27

• Main principle
• TRF with regeneration

• 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: SW-3 Model I [var 1a] - National Company; Cambridge &

• Shape
• Tablemodel, with any shape - general.

• Notes
• plug-in coils with color code or numbers series "10-22";
  headphones operation only, no audio output stage
  possibly identical to Thrill Box SW-3

• Price in first year of sale
• 55.00 $

• External source of data
• Ernst Erb

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

• 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)