• Country
• United States of America (USA)

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

• Year
• 1939

• Category
• Miscellaneous (Other, Various) - see notes

• Radiomuseum.org ID
• 49545

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

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

• Number of Tubes
• 1

• Valves / Tubes
• 6X5

• Power type and voltage
• 6 Volt

• from Radiomuseum.org
• Model: 686SB - National Company; Cambridge &

• Notes
• vibrator pack for 6V DC, same as 686S, but with mounting brackets;
  output power 165V DC (B+ voltage), 45 mA
  used to power HRO / HRO-5 series receivers

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 22, covering 1951

• 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)