• Country
• United States of America (USA)

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

• Year
• 1947

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 71946

• • Brand: Magic Tone

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

• Number of Tubes
• 4

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

• Main principle
• TRF without regeneration

• Tuned circuits
• 2 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• AC/DC-set / 117 Volt

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

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Magic-Tone 504 - Radio Development & Research

• Shape
• Design Radio or Novelty / Gadget - fancy or unusual shape.

• Dimensions (WHD)
• 200 x 370 x 140 mm / 7.9 x 14.6 x 5.5 inch

• Notes
• Note the "RDR" logo in the middle of the label. The 2-piece cap is the on/off/volume and tuning controls, and the bakelite base contains the speaker (facing downward). The 4-tube chassis is inside the 'bottle' and gives reception to rather strong stations only. The real brownish glass bottle is specifically made for this radio and not adapted from an existing bottle. There is a hole at the rear side.
  
  The pilot light inside the bottle gives a warm and nice atmosphere. Please be very carefulwith the label because it looses the water soluble paint (not paper) if you try to clean it with a liquid. Often such radios have therefore lost its label, the tuning scale around the neck of the bottle es anyhow missing on most examples.

• Source of data
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Circuit diagram reference
• Rider's Perpetual, Volume 17 = 1948 and before

• Literature/Schematics (1)
• -- Schematic

• Author
• Model page created by Ernst Erb. See "Data change" for further contributors.

• 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