• Country
• United States of America (USA)

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

• Year
• 1927

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 57904

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

• Number of Tubes
• 4

• Valves / Tubes
• UX201A UX201A UX201A UX201A

• Main principle
• TRF without regeneration

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Powered by external power supply or a main unit.

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Time Signal Amplifier SM 440 - Silver - Marshall; Chicago, IL

• Shape
• Chassis only or for «building in»

• Notes

• Jewelers 112 kc. (2677 meters) time signal amplifier. Three RF stages and detector.

  See similar model SM-440 SG.

• Price in first year of sale
• 35.00 $

• External source of data
• Ernst Erb

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

• Literature/Schematics (1)
• Radio Broadcast, Sep. 1927, p. 309

• Literature/Schematics (2)
• -- Original prospect or advert (Haskell Radio Corp., 180 N. Union Ave, Chicago, ILL., Catalog Page 16, circa 1927)

• 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