• Country
• United States of America (USA)

• Manufacturer / Brand
• Radio Development & Research Corp. (RDR) USA

• Year
• 1946

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 82842

• • Brand: Magic Tone

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

• Number of Tubes
• 5

• Valves / Tubes
• 12SA7 12SK7 12SQ7 50L6 35Z5

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• AC/DC-set / 110 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: Magic-Tone 501 - Radio Development & Research

• Shape
• Tablemodel, with any shape - general.

• Notes
• The maker (RDR) made "spy radios" for the OSS and CIA. Models like this are believed to have been a 'front' activity, to hide their real work. The model 500 is the same, but uses Loktal tubes. The model 501 uses octal tubes.

• Circuit diagram reference
• Rider's Perpetual, Volume 15 = 1947 and before

• Mentioned in
• Photofact Folder, Howard W. SAMS (Folder 465-40 date 10-46)

• Literature/Schematics (1)
• -- Schematic

• Other Models

• Here you find 11 models, 7 with images and 10 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Development & Research Corp. (RDR) USA