• Country
• United States of America (USA)

• Manufacturer / Brand
• Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)

• Year
• 1928/1929 ?

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 43688

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

• Number of Tubes
• 1

• Valves / Tubes
• 80

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 90-130 Volt

• Loudspeaker
• - - No sound reproduction output.

• from Radiomuseum.org
• Model: Majestic Power Pack 7P6 - Grigsby-Grunow -Hinds Co.

• Notes
• Power Pack for the Majestic "70" series. 60Hz

• External source of data
• Ernst Erb

• Source of data
• - - Manufacturers Literature

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

• Literature/Schematics (1)
• Beitman Radio Diagrams, Vol. 01, 1926-1938

• Other Models

• Here you find 201 models, 122 with images and 157 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)