• Country
• United States of America (USA)

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

• Year
• 1958/1959

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 166345

• • alternative name: Chicago Radio Lab

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

• Number of Transistors
• 7

• Semiconductors
• 2N252 2N485 2N253 2N254 2N362 2N362 2N362 1N87G

• 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": 4 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= 7AT43Z1 - 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

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Date 5-59, Set 441, Folder 20)

• Author
• Model page created by Egon Penker. 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