• Country
• United States of America (USA)

• Manufacturer / Brand
• Roland Radio Corporation; Mount Vernon (NY)

• Year
• 1960 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 143089

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

• Number of Transistors
• 5

• Semiconductors
• 2N412 2N409 2N406 2N405 2N405

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / AA: 6 x 1.5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 3 inch = 7.6 cm

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: All Transistor Bi-Fidelity 51-481 - Roland Radio Corporation;

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

• Notes

• Battery operated transistorized portable AM receiver.

  This model is very similar to TR5.

• Mentioned in
• Collector's Guide To TrR1 Bunis trans.94 (1996, page 232)

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Set 480 folder 11 date 4-60)

• Author
• Model page created by Peter Hoddow. See "Data change" for further contributors.

• Other Models

• Here you find 68 models, 57 with images and 62 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Roland Radio Corporation; Mount Vernon (NY)