S-4

• Country
• United States of America (USA)

• Manufacturer / Brand
• Echophone Radio, Inc. - see also (The) Radio Shop or Hallicrafters Inc.

• Year
• 1930/1931

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 37975

• • Brand: Ufonic

• Picture
• Schematics

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

• Number of Tubes
• 6

• Valves / Tubes
• 224 224 224 227 245 280

• Main principle
• TRF without regeneration; Screengrid 1926-1935

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC) / 115; 125 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 8 inch = 20.3 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: S-4 - Echophone Radio, Inc. - see

• Shape
• Table-Cathedral-Type (upright, round top or gothic arch, not rounded edges only).

• Dimensions (WHD)
• 14 x 17 x 7 inch / 356 x 432 x 178 mm

• Notes
• Reference for the date: "Los Angeles Radio Manufacturing" by Floyd A. Paul. (1988), page 13: shows that in Autumn 1930, Echophone moved at least the production from Hollywood to Illinois and for December show in a service manual from December 1930 the chassis of S-3, S-4, S-5 and F. The schematic diagram of S-3 has a date of 9-5-30. For S-5 there is also the 7 tube version having a Dynatron oscillator/mixer.

• External source of data
• Ernst Erb

• Source of data
• Collector's Guide to Antique Radios 4. Edition

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

• Mentioned in
• Guide to Old Radios

• Other Models

• Here you find 83 models, 40 with images and 44 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Echophone Radio, Inc. - see also (The) Radio Shop or Hallicrafters Inc.