• Country
• United States of America (USA)

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

• Year
• 1957

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 73950

• • alternative name: Chicago Radio Lab

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

• Number of Transistors
• 7

• Semiconductors

• Main principle
• Superheterodyne (common)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries

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

• Power out
• 0.1 W (unknown quality)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Royal 300 Ch=7AT42 - Zenith Radio Corp.; Chicago,

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 91 x 149 x 39 mm / 3.6 x 5.9 x 1.5 inch

• Notes
• Conelrad Markings (Civil Defense, CD) on the dial at 640 and 1240 kHz.
  Different colors: ebony, maroon, pine frost green, and very few in white;

• Net weight (2.2 lb = 1 kg)
• 0.510 kg / 1 lb 2 oz (1.123 lb)

• Price in first year of sale
• 60.00 $

• Mentioned in
• Zenith Transistor Radios

• Literature/Schematics (1)
• -- Original-techn. papers.

• Author
• Model page created by Konrad Birkner † 12.08.2014. 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