• Country
• United States of America (USA)

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

• Year
• 1950 ?

• Category
• Radio module post 1925 (not a part, not a key)

• Radiomuseum.org ID
• 87466

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

• Number of Tubes
• 2

• Valves / Tubes
• 6SK7 6H6

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

• Material
• Metal case

• from Radiomuseum.org
• Model: Narrow Band FM - Adaptor NFM-50 - National Company; Cambridge &

• Shape
• Chassis only or for «building in»

• Notes
• plug in adaptor / demodulator for narrow band FM transmissions, plug-in subchassis; matches National HRO-50 receiver.

• Price in first year of sale
• 17.00 $

• Source of data
• Shortwave Receivers - Past & Present (3rd ed.)

• Circuit diagram reference
• Rider's Perpetual, Volume 21, Copyright 1950

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

• 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)