• Country
• United States of America (USA)

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

• Year
• 1929

• Category
• Car Radio, perhaps also + sound player/recorder

• Radiomuseum.org ID
• 57965

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

• Number of Tubes
• 5

• Valves / Tubes
• 12A 24A 24A 24A 71A

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown); Screengrid 1926-1935

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries / ? & 45 & 90 & 135 & -4,5 & -27 Volt

• Material
• Metal case

• from Radiomuseum.org
• Model: Auto 770 - Silver - Marshall; Chicago, IL

• Shape
• Chassis only or for «building in»

• Notes
• One dial (primary tuning control knob)

• Price in first year of sale
• 112.00 $

• External source of data
• Ernst Erb

• Source of data
• Radio Collector`s Guide 1921-1932

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

• Literature/Schematics (1)
• -- Schematic

• 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