• Country
• United States of America (USA)

• Manufacturer / Brand
• Sparks-Withington Co., (Sparton); Jackson, Michigan

• Year
• 1936

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 239887

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

• Number of Tubes
• 5

• Valves / Tubes
• 6A7 78 75 42 80

• Main principle
• Superheterodyne (common); ZF/IF 456 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast and Short Wave (SW).

• Power type and voltage
• Alternating Current supply (AC) / 50 Hz; 95 - 250 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Material
• Various materials

• from Radiomuseum.org
• Model: Sparton 557-X blue ch= 517 [export model] - Sparks-Withington Co., Sparton

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 410 x 210 x 210 mm / 16.1 x 8.3 x 8.3 inch

• Notes

• So called "Sled", blue mirror glass.

  Export version for 50Hz mains at 95 to 250 V. Otherwise similar to 557.

• Mentioned in
• Rider's Perpetual, Volume 8 = 1937 and before

• Author
• Model page created by Jose Assuncao. See "Data change" for further contributors.

• Other Models

• Here you find 773 models, 361 with images and 720 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sparks-Withington Co., (Sparton); Jackson, Michigan