Royal 300 Ch=7AT42 (7AT42Z1)

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.

 Technical Specifications

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

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