• Country
• United States of America (USA)

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

• Year
• 1927

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 57997

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

• Number of Tubes
• 4

• Valves / Tubes
• UX171 UX171 CX374 or UX874 85-mills.

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

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

• Material
• Metal case

• from Radiomuseum.org
• Model: Unipac 660-171 [power supply & amp] - Silver - Marshall; Chicago, IL

• Notes

• The Silver-Marshall Unipac 660-171 is a combination push-pull amplifier and power supply. The QRS tube is an 85 miliamp gaseous rectifier.

• Price in first year of sale
• 74.00 USD

• 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