• Country
• United States of America (USA)

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

• Year
• 1932–1934

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 58568

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

• Number of Tubes
• 13

• Valves / Tubes
• 58 24 58 56 56 56 47 47 47 47 56 80 80

• Main principle
• Superhet with RF-stage; ZF/IF 172.5 kHz; 2 AF stage(s)

• Tuned circuits
• 8 AM circuit(s)

• Wave bands
• Broadcast only (MW).

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

• Loudspeaker
• 3 Loudspeakers

• Material
• Wooden case

• from Radiomuseum.org
• Model: Sparton 28 Triolian - Sparks-Withington Co., Sparton

• Shape
• Console, Lowboy (legs < 50 %).

• Dimensions (WHD)
• 31.5 x 45.25 x 16 inch / 800 x 1149 x 406 mm

• Notes

• Bandfilter input circuits. Push-pull audio amplifier using 2 x 2 type 47 tubes in parallel. Inter-station noise suppressor. Three electrodynamic speakers, one (center) of 12 inch and the two of 8 inch diameter.

• Price in first year of sale
• 165.00 $

• External source of data
• Ernst Erb

• Source of data
• Radio Collector`s Guide 1921-1932

• Circuit diagram reference
• Rider's Perpetual, Volume 4 = ca. 1934 and before

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965 (Rider's 4-6)

• Literature/Schematics (1)
• Pre-War Consoles

• Literature/Schematics (2)
• Radio Retailing (Radio & Television R.) (June 1933 page 19.)

• Literature/Schematics (3)
• Sparton Radio Service Manual (Sparton Manual 1, Bulletin 48-1, 2, 3 Bulletin 31-3, 4)

• Other Models

• Here you find 807 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