• Country
• United States of America (USA)

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

• Year
• 1930 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 58865

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

• Number of Tubes
• 10

• Valves / Tubes
• 484 484 484 484 484 484 484 183/483 183/483 80

• Main principle
• TRF without regeneration

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC) / 100-130 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Sparton 737AC - Sparks-Withington Co., Sparton

• Notes

• Rider's Perpetual (Volume 2) brings also different Power Converters like the AC-737. But the tube lineup is not suitable for serial filament supply, and there is no trace of a special DC circuitry, nor a hookup for battery operation. AC is obviously the one and only mode.

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

• Literature/Schematics (1)
• Beitman Radio Diagrams, Vol. 01, 1926-1938

• Literature/Schematics (2)
• Sparton Radio Service Manual (Sparton Manual 1, Bulletin 29-1, 2 Bulletin 6-3, 4)

• Other Models

• Here you find 817 models, 365 with images and 754 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sparks-Withington Co., (Sparton); Jackson, Michigan