• Country
• United States of America (USA)

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

• Year
• 1936

• Category
• Car Radio, perhaps also + sound player/recorder

• Radiomuseum.org ID
• 67984

• • alternative name: Chicago Radio Lab

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

• Number of Tubes
• 7

• Valves / Tubes
• 6K7G 6A8G 6K7G 6Q7G 6C5G 6N7G 6X5G

• Main principle
• Superhet with RF-stage; ZF/IF 252 kHz

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / =6 Volt

• Material
• Metal case

• from Radiomuseum.org
• Model: 7M91S Ch=5706 - Zenith Radio Corp.; Chicago,

• Notes

• Steering column controls; choice of speakers;

   

   

  Car radio 7-S-91D and 7-M-91D use the same case.

  7-M-91D is dashboard mounted , 7-M-91-S is mounted on steering.

• Price in first year of sale
• 70.00 $

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 7 = 1936 and before

• 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