• Country
• United States of America (USA)

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

• Year
• 1939

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 49544

• • 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
• Storage and/or dry batteries / 6 Volt

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

• Notes
• Vibrator pack for 6V DC, uses mallory 626 vibrator and 6X5 rectifier, improved circuitry (capacitors); 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 17 = 1948 and before

• 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)