• Country
• unknown Country

• Manufacturer / Brand
• Challenge; (where?)

• Year
• 1964 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 227709

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

• Number of Transistors
• 12

• Semiconductors
• 2SA71 2SA71 2SA104 2SA70 2SA104 2SA104 2SB175 2SB175 2SB175 2SB175 2SD178 2SB178 OA90 OA90 OA90 OA90

• Main principle
• Superheterodyne (common); ZF/IF 470/10700 kHz; 4 AF stage(s)

• Tuned circuits
• 5 AM circuit(s)     8 FM circuit(s)

• Wave bands
• Broadcast, Long Wave, Short Wave plus FM or UHF.

• Power type and voltage
• Dry Batteries / 4 x 1.5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 8 cm = 3.1 inch

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: FM/AM 4 Band 12 Transistor R-66 - Challenge; where?

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

• Dimensions (WHD)
• 248 x 185 x 83 mm / 9.8 x 7.3 x 3.3 inch

• Notes

• Also 4 diodes and thermistor.

  VHF is 86MHz to about 112MHz
  SW is 49m to 16m approx.
  LW is 2000m to 800m approx.
  MW is about 560m to 180m
  There is AFC on/off and tone H / L switches.
  Earphone jack 3.5mm
  780mm Telescopic aerial (to universal joint).
  Schematic is tiny 35 x 50 mm on inside rear cover.

  See also: Tokyo Transistor Industry Candle VMSS-1223

  Made in Japan 712

• Net weight (2.2 lb = 1 kg)
• 1.6 kg / 3 lb 8.4 oz (3.524 lb)

• Literature/Schematics (4)
• -- Schematic

• Author
• Model page created by Michael Watterson. See "Data change" for further contributors.

• 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?)