• Country
• United States of America (USA)

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

• Year
• 1937/1938

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 58869

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

• Number of Tubes
• 8

• Valves / Tubes
• 6A8G 6K7G 6H6G 6J7G 6E5 6Q7G 6V6G 5Y3G

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

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast only (MW).

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

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Sparton 738 Selectime Telechron clock - Sparks-Withington Co., Sparton

• Shape
• Tablemodel with Clock ((Alarm-) Clock Radio).

• Dimensions (WHD)
• 16 x 19 x 9.75 inch / 406 x 483 x 248 mm

• Notes

• This Sparton 738 Selectime or Selectone clock radio model with a Telechron clock is very unique: The front shows only an alarm clock instead of a scale and above it there are 6 station pushbuttons. The two knobs below the clock are only volume control and tone control, no other tuning but with the 6 push buttons is possible. On the top of the tombstone is the loudspeaker. The magic eye is sticking up on the chassis like the other tubes ... Since the tuning of the buttons is done from the rear, this is the only right way to place the magic eye. The alarm clock can be set on quarter intervals by selecting the "wake up" time. For that time also a thombstone radio is unusual. The schematic tells "effective January 2, 1938".

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 9 = 1938 and before

• Mentioned in
• Rider's 9-13, 9-14

• Literature/Schematics (1)
• Machine Age to Jet Age II (page 284.)

• Literature/Schematics (2)
• Cathedral & Tombstone Radios (page 255.)

• 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