Kenwood / Trio - Kenwood Communications, Tokyo
9R - 59 DS
überarbeitet am 21.10.2010
In 1968, the japanese Trio Corporation presented the 9R-59DE and 9R-59DS as successors for their 9R-59 set. This early "All Wave Receiver" from japanese production covers the whole shortwave range, only in the amateur radio bands and on mediumwaves, the dial accuracy is sufficient for reasonable DXing. But amongst mediumwave specialists, the 9R-59DS had a very good reputation due to it's mechanical IF filters and it's reasonable price tag.
The 9R-59DS is a medium sized desktop receiver; the dimensions of the metal cabinet are 380 x 180 x 260 mm, the 8 tubes hollow state set weighs 8 kg. The power supply can be set to 115 or 220 V AC mains. The 9R-59DS has no internal speaker, the SP-5D is the matching optional speaker.
The main tuning knob is a double concentric knob: the outer ring activates
the coarse or main tuning. The receiver has continuous coverage from 550 kHz to
30 MHz. The dial accuracy of the main tuning dial is acceptable in the mediumwave
band, on the high frequency bands, the dial calibration is almost useless.
The inner knob activates the bandspread dial at the right of the signal strength
meter: when the Main Tuning dial is set to one of the Amateur band calibration
marks, You can read the amateur band frequency directly from the right bandspread dial.
The big analog S meter indicates the signal level, You can adjust it's level using
a control at the rear of the receiver.
In practical use, one of the peculiarities of the receiver is the narrow IF filter:
with high signal strengths, it tends to ringing effects, but it has an excellent
selectivity for mediumwave DXing. With longer antennas, the receiver can suffer
from intermodulation effects and appearing "ghost signals" due to it's single
As an improvement and successor of the set, the German importer Richter / Ricofunk ordered a solid state version of the set to be made from a japanese manufacturer. The Minix MR-73 features an internal crystal calibrator, it's small brother, the MR-55A, covers only the amateur radio bands.
© Martin Bösch 7.1.2009