• Country
• United States of America (USA)

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

• Year
• 1933/1934 ?

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

• Radiomuseum.org ID
• 85424

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

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

• Number of Tubes
• 7

• Valves / Tubes
• 57 24 58 58 56 59 24

• Main principle
• Superheterodyne (common); ZF/IF 500 kHz

• Wave bands
• Short Wave (SW only)

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

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: FB-7A - National Company; Cambridge &

• Shape
• Tablemodel, with any shape - general.

• Notes

• The "A" suffix of the FB-7A stood for "air-tuned" versus mica compressed IF transformers.

  2,5V-heated tubes and air-tuned IF transformers:
  coverage 1500 - 20000 kHz (coils FB A-E), 800 - 34000 kHz (with optional coils FB AA-F), 20 - 160 m amateur bands (with optional bandspread coils AB 20-160);
  optional external RF preselector;
  optional external power supplies 5880AB, 5887AB or high voltage 5897AB

• Price in first year of sale
• 31.00 $

• Source of data
• Communications Receivers

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

• 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)