• Country
• United States of America (USA)

• Manufacturer / Brand
• Western Auto Supply Co. (Truetone); Kansas City (MO)

• Year
• 1936

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 65927

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

• Number of Tubes
• 8

• Valves / Tubes
• 6K7 6K7 6C5 6K7 6G5 6Q7 6F6 5Z4MG

• Main principle
• Superhet with RF-stage; ZF/IF 456 kHz; 2 AF stage(s)

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast plus 2 Short Wave bands.

• Power type and voltage
• Alternating Current supply (AC) / 117 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Truetone Challenger D-721 - Western Auto Supply Co.

• Shape
• Console with any shape - in general

• Notes
• Mismo esquema para D-701, D-721 y S-721. Algún modelo no lleva la 6G5. Same schematic for all three above. Unknown which of them have not the 6G5.

• External source of data
• Ernst Erb

• Source of data
• Pre-War Consoles

• Circuit diagram reference
• Rider's Perpetual, Volume 10 = 1939 and before

• Literature/Schematics (1)
• -- Schematic (Riders 10-23, 24, 25)

• Other Models

• Here you find 892 models, 507 with images and 783 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Western Auto Supply Co. (Truetone); Kansas City (MO)