• Country
• United States of America (USA)

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

• Year
• 1976 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 336450

• • alternative name: Chicago Radio Lab

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Superheterodyne (common); ZF/IF 455/10700 kHz

• 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) / Ø 4 inch = 10.2 cm

• Power out
• 1 W (unknown quality)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: H421W Circle of sound - Zenith Radio Corp.; Chicago,

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

• Dimensions (WHD)
• 282 x 125 x 164 mm / 11.1 x 4.9 x 6.5 inch

• Notes

• Model H421W AM/FM is a Table Radio that features vernier type tuning; illuminated semi-circular dial scale; "Target Tuning" LED indicator on pointer; downward directed "Circle of Sound" speaker; AFC and separate RF stage on FM; AGC on AM; push/push type ON/OFF switch; rotary band selector and tone controls; built-in "Wavemanagement" for AM and line cord antenna for FM.

  Made in Korea

   

• Mentioned in
• -- Original prospect or advert (Suffolk News-Herald. Dec 10, 1977, page 11)

• Author
• Model page created by Sándor Selyem-Tóth. 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