• Country
• United States of America (USA)

• Manufacturer / Brand
• Major Laboratories

• Year
• 1929

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 46750

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

• Number of Tubes
• 3

• Valves / Tubes

• Power type and voltage
• Alternating Current supply (AC) / 115 Volt

• from Radiomuseum.org
• Model: 250 Power Supply - Major Laboratories

• Notes
• Used in combination with the 250 power amplifier.

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Mentioned in
• Misc. Page 1-14

• Other Models

• Here you find 4 models, 0 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Major Laboratories