• Country
• United States of America (USA)

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

• Year
• 1929

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 49619

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

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

• Number of Tubes
• 4

• Valves / Tubes
• UX222 UX200A UX240 UX171A

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

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

• Power type and voltage
• Storage and/or dry batteries / 6; 45; 135; 180 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Thrill Box SW-4 - National Company; Cambridge &

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Notes
• four + three optional plug-in coils: 15,5-26,6 m / 23,5-41 m / 37,5-65 m / 64-115 m / optional 110-175 m / 170-300 m / 290 - 570 m
  also sold as kit 45,90 US$, metal cabinet 5,25 US$
  optional external power supply National 3580B

• Price in first year of sale
• 55.00 $

• External source of data
• Ernst Erb

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

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Literature/Schematics (1)
• Chicago Salvage Stock Store catalogue, 1928?

• Literature/Schematics (2)
• Radio-Broadcast, Oct. 1929

• 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)