• Country
• United States of America (USA)

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

• Year
• 1934/1935

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

• Radiomuseum.org ID
• 67915

• • alternative name: Chicago Radio Lab

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

• Number of Tubes
• 5

• Valves / Tubes
• 6D6 6D6 75 42 84

• Main principle
• Superhet with RF-stage; ZF/IF 175 kHz

• Tuned circuits
• 5 AM circuit(s)

• Wave bands
• Broadcast only (MW).

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

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

• Material
• Metal case

• from Radiomuseum.org
• Model: 7 - Zenith Radio Corp.; Chicago,

• Shape
• Chassis only or for «building in»

• Notes
• The name 7JR is a doubtful listing. Should be just "7". Zenith parts list mentions "JR.Model 7" (not 7JR). It is sometimes listed as 7Jr as the smaller, cheaper "Junior" model, with only 5 tubes, for half the usual price. See also Cones-Bryant: Zenith, the early years, pp.193, 202.

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 5 = ca. 1934 and before

• Mentioned in
• Zenith Radio The Early Years 1919-1935

• Literature/Schematics (1)
• Zenith Service Manual

• Other Models

• Here you find 4491 models, 4096 with images and 3601 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Zenith Radio Corp.; Chicago, IL