Royal 700L Ch= 7AT43Z3

Zenith Radio Corp.; Chicago, IL

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  • Year
  • 1957/1958
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 180862
    • alternative name: Chicago Radio Lab

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

 Technical Specifications

  • Number of Transistors
  • 7
  • Main principle
  • Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)
  • Tuned circuits
  • 5 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Dry Batteries / "C": 6 x 1.5 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm
  • Power out
  • 0.275 W (0.4 W max.)
  • Material
  • Leather / canvas / plastic - over other material
  • from Radiomuseum.org
  • Model: Royal 700L Ch= 7AT43Z3 - Zenith Radio Corp.; Chicago,
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Dimensions (WHD)
  • 8.125 x 5.25 x 3.25 inch / 206 x 133 x 83 mm
  • Notes

  • The Zenith Royal 700L is a portable, battery operated 7 transistor AM band radio.  The AM band frequency tuning range is 540 to 1600kHz.  Has push-pull audio output stage and earphone jack that disconnects the speaker for private listening.  Was available with either a brown or black leather case.

    Transistor shortages in the late 1950's from the transistor manufacturers forced Zenith to have slightly different designs using different chassis with transistors from 3 different manufacturers.

    Model Chassis

    Transistor Manufacturer

    		 Chassis Dot and Transistor Label Color
    Royal 700L 7AT43 All transistors from Sylvania Red
    Royal 700L 7AT43Z3 Output transistors from RCA, all others from Sylvania Green
    Royal 700L 7AT43Z1 All transistors from Texas Instruments Blue

     

  • Author
  • Model page created by Egon Penker. See "Data change" for further contributors.

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