• Country
• United States of America (USA)

• Manufacturer / Brand
• Silver - Marshall; Chicago, IL

• Year
• 1929 ?

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 57920

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

• Number of Tubes
• 4

• Valves / Tubes
• 27 45 45 80

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 105 - 120 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Material
• Metal case, TUBES VISIBLE

• from Radiomuseum.org
• Model: Power Supply & Amp 677 B - Silver - Marshall; Chicago, IL

• Shape
• Tablemodel, with any shape - general.

• Notes
• Power supply and amplifier unit; push-pull af output stage.
  For use with a 712, 714 or similar Tuner.

• External source of data
• Ernst Erb

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

• Other Models

• Here you find 225 models, 116 with images and 122 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Silver - Marshall; Chicago, IL