• Country
• United States of America (USA)

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

• Year
• 1970 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 241739

• • alternative name: Chicago Radio Lab

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Superheterodyne (common)

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

• Power type and voltage
• Alternating Current supply (AC) / 120 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: R421 Circle of Sound - Zenith Radio Corp.; Chicago,

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

• Dimensions (WHD)
• 283 x 130 x 178 mm / 11.1 x 5.1 x 7 inch

• Notes

• Made in Korea.

• Net weight (2.2 lb = 1 kg)
• 1.816 kg / 4 lb 0 oz (4 lb)

• Author
• Model page created by Daniel Rosha. See "Data change" for further contributors.

• Other Models

• Here you find 4504 models, 4100 with images and 3631 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Zenith Radio Corp.; Chicago, IL