• Country
• United States of America (USA)

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

• Year
• 1959 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 79109

• • alternative name: Chicago Radio Lab

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

• Number of Tubes
• 7

• Valves / Tubes
• 6BJ6 12AT7 12BA6 12BA6 12AU6 19T8 35C5

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

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

• Power type and voltage
• AC/DC-set / 117 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) - elliptical

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: C725C "The Super Sapphire" Ch= 7C06 - Zenith Radio Corp.; Chicago,

• Shape
• Tablemodel without push buttons, Mantel/Midget/Compact up to 14

• Dimensions (WHD)
• 13.375 x 8.75 x 7.625 inch / 340 x 222 x 194 mm

• Notes

• The Zenith C725C is an AC/DC operated 7 tube AM/FM receiver.  The AM band frequency tuning range is 535 to 1620kHz.  The FM band frequency tuning range is 88 to 108MHz.  Uses Selenium Rectifier in power supply. Has loop antenna for AM and uses the line cord for the FM antenna with provisions for connecting an external FM antenna. Has phonograph input jack on back of the radio, with the radio/phono select switch also located on the back of the radio.

  This model is part of the C725/C730 family of radio's:

  Model	Chassis	Speaker(s)	Cabinet Color
  C725C	7C06	Elliptical PM 4" x 6"	Charcoal
  C725F	7C06	Elliptical PM 4" x 6"	Gray-Green
  C725L	7C06	Elliptical PM 4" x 6"	Brown
  C730	7C05	Elliptical PM 4" x 6" and Electrostatic Speaker	Mahogany
  C730E	7C05	Elliptical PM 4" x 6" and Electrostatic Speaker	Blonde Oak
  C730R	7C05	Elliptical PM 4" x 6" and Electrostatic Speaker	Walnut

   

• Circuit diagram reference
• Beitman Radio Diagrams Vol. 20, 1960

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Set 478 Folder 19 date 3-60)

• Author
• Model page created by Trev Levick. See "Data change" for further contributors.

• 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