• Country
• United States of America (USA)

• Manufacturer / Brand
• Zenith Radio Corp.; Chicago, IL

• Year
• 1964 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 253860

• • alternative name: Chicago Radio Lab

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

• Number of Tubes
• 7

• Valves / Tubes
• 12DT8 12BE6 12BA6 12BA6 12AU6 14GT8 35C5

• Main principle
• Superheterodyne (common); ZF/IF 455/10700 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)     10 FM circuit(s)

• Wave bands
• Broadcast (BC) and FM or UHF.

• Power type and voltage
• AC/DC-set / 120 Volt

• Loudspeaker
• 2 Loudspeakers

• Material
• Wooden case

• from Radiomuseum.org
• Model: K731R Ch= 7M07 [american cabinet, mahogany] - Zenith Radio Corp.; Chicago,

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 15.63 x 9.94 x 7.63 inch / 397 x 252 x 194 mm

• Notes

• The Zenith K731R is an AC/DC operated 7 tube AM-FM receiver. The AM band tuning range is 540 to 1620 kHz. The FM band tuning range is 88 to 108 MHz. Built-in loop antenna for AM. FM uses line cord for antenna with provisions for external antenna.

  American Provincial Cabinet in Mahogany veneers.

• Other Models

• Here you find 4496 models, 4101 with images and 3615 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Zenith Radio Corp.; Chicago, IL