• Country
• United States of America (USA)

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

• Year
• 1927

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 58975

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

• Number of Tubes
• 8

• Valves / Tubes
• 401_McCullough 401_McCullough 401_McCullough 401_McCullough 401_McCullough 171 171 BH

• Main principle
• TRF without regeneration

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

• Loudspeaker
• Magnetic loudspeaker (reed) of high quality (4 magnet poles). / Ø 17 inch = 43.2 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: Sparton AC-7 - Sparks-Withington Co., Sparton

• Shape
• Console with any shape - in general

• Dimensions (WHD)
• 30.5 x 41 x 14 inch / 775 x 1041 x 356 mm

• Notes

• The Sparton model AC-7 has one dial (primary tuning control knob) operation. The ad September 1927 of "Radio Retailing" page 151 includes the models 6-15, AC 6-15, 6-26 and AC-7. It was already offered in July 1927 for $ 375. See also the article here about different radio seasons.

• Price in first year of sale
• 375.00 $

• 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)

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Literature/Schematics (1)
• Radio Manufacturers of the 1920's, Vol. 3 (page 119)

• Literature/Schematics (2)
• Radio Retailing (Radio & Television R.) (September 1927, page 151)

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

• 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