• Country
• United States of America (USA)

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

• Year
• 1973 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 326162

• • alternative name: Chicago Radio Lab

• Number of Transistors
• 9

• Semiconductors

• Main principle
• Superheterodyne (common)

• Tuned circuits
• 5 AM circuit(s)     9 FM circuit(s)

• Wave bands
• Broadcast (BC) and FM or UHF.

• Power type and voltage
• Dry Batteries / 1 x 9 Volt

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

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Royal RB21Y - Zenith Radio Corp.; Chicago,

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

• Dimensions (WHD)
• 135 x 103 x 30 mm / 5.3 x 4.1 x 1.2 inch

• Notes

• Zenith RB21Y

  See similar model Zenith RB21L.

  Made in Hong Kong

• Net weight (2.2 lb = 1 kg)
• 0.4 kg / 0 lb 14.1 oz (0.881 lb)

• Literature/Schematics (1)
• Photofact TSM Transistor Radio Series SAMS (TSM-141, Feb. 1973)

• Author
• Model page created by Eckhard Wegner. 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