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R-66 (Japan 712)

R-66 ; Challenge; where? (ID = 1352165) Radio
R-66 ; Challenge; where? (ID = 1351694) Radio R-66 ; Challenge; where? (ID = 1351695) Radio
R-66 ; Challenge; where? (ID = 1351696) Radio R-66 ; Challenge; where? (ID = 1351697) Radio
R-66 ; Challenge; where? (ID = 2357757) Radio
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R-66 ; Challenge; where? (ID = 1351694) Radio
Challenge; where?: R-66 [Radio] ID = 1351694 933x976
Select picture or schematic to display from thumbnails on the right and click for download.
For model R-66 (Japan 712), Challenge; (where?)
Country:  Japan
Manufacturer / Brand:  Challenge; (where?)
Year: 1964 ?? Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) 12: 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
Power out
from Model: R-66 - Challenge; where?
Material Leather / canvas / plastic - over other material
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

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

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

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