• Country
• unknown Country

• Manufacturer / Brand
• Challenge; (where?)

• Year
• 1965 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 330773

• Number of Transistors
• 8

• Semiconductors

• Main principle
• Superheterodyne (common)

• Wave bands
• Broadcast, Long Wave and Short Wave.

• Power type and voltage
• Dry Batteries

• Loudspeaker
• 2 Loudspeakers

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: 3 Band 8 Transistor Hi-Fi 2 Speaker R57 - Challenge; where?

• Shape
• Portable set > 8 inch (also usable without mains)

• Notes

• SW = 6 - 15 MHz

• Other Models

• Here you find 4 models, 4 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Challenge; (where?)