• Country
• United States of America (USA)

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

• Year
• 1930

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 57938

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

• Number of Tubes
• 8

• Valves / Tubes
• 32 32 30 32 32 30 31 31

• Main principle
• Superhet with RF-stage; ZF/IF 175 kHz; Screengrid 1926-1935

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries / ? & 67,5 & 135 & -4,5 & -22,5 Volt

• from Radiomuseum.org
• Model: SM-724 DC [old] - Silver - Marshall; Chicago, IL

• Notes

• One dial (primary tuning control knob) One dial (primary tuning control knob); push-pull af output stage.

  According to Tyne, page 329, the tube UX230 (30) and the tube UX232 (32) arrived in 1930. Therefore this model can not be from before or had another first tube line-up.

• Price in first year of sale
• 82.00 $

• 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)

• 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