• Country
• United States of America (USA)

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

• Year
• 1931–1933

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 49550

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

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

• Number of Tubes
• 5

• Valves / Tubes
• 35 35 27 45 45

• Main principle
• TRF with regeneration

• Tuned circuits
• 2 AM circuit(s)

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

• Power type and voltage
• Powered by external power supply or a main unit.

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

• Material
• Metal case

• from Radiomuseum.org
• Model: SW45-AC - National Company; Cambridge &

• Shape
• Tablemodel, with any shape - general.

• Notes

• The National SW-45 Receiver covers 2000 to 9 meters with plug-in coils (see National SW Coil Data). The receiver came with  four sets of coils covering 14.5 to 115 meters.

  The SW-45 is a National SW-5 with type 45 tubes in push-pull.

• Price in first year of sale
• 79.00 $

• External source of data
• Ernst Erb

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

• Mentioned in
• QST (April 1933 page 79)

• 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)