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Kenwood Trio 9R-59D HF

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The Trio 9R-59D and 9R-59DS are two slightly different versions of the same communications receiver manufactured by Trio (later Kenwood) Electronics in Japan during the years 1969-1974. The receiver is an 8-tube single-conversion design (455 kHz IF), covering from 0.55 to 30 MHz in four bands, and featuring a calibrated electrical bandspread for the ham bands. 

The receiver provided an excellent value for its cost (105 $ in 1971), since it had good selectivity (ceramic IF filter) and stability and included a product detector for SSB reception. For those reasons it became very popular especially with SWLs in Europe and many good units are still available for sale, mainly in Germany.

Trio 9R-59D

This receiver is of more modern desing than the predecessors like the Lafayette HA-230 and HE-30 (which was in fact also known as Trio 9R-59 outside USA). It uses two printed boards (IF and AF stages) and there are silicon rectifiers in the power supply. It is probably equivalent to the Lafayette HA-700, except for the different dial arrangement (slide-rule type in the HA-700) and the use of different tubes. 

The 9R-59D(DS) has a RF stage, S-meter, ceramic IF filter, tunable BFO and product detector. The stability is good and SSB reception is OK, much better than on the HA-230. The versions found in Europe are wired for 220 V power, so one does not need any external transformer.
Type:HF receiver
Frequency range:0.55-30 MHz
Receiver system:
Image rejection:
Current drain:? mA
Impedance:50 ohms / SO-239
Dimensions (W*H*D):? mm
Weight:? Kg
Manufactured:Japan, 196x-196x (Discontinued)
Related documents:


Tube complement

  • A 550-1600 kHz
  • B 1.6 - 4.8 MHz
  • C 4.8 - 14.5 MHz
  • D 10.5 - 30 MHz
  • V1 6BA6 RF Amp.
  • V2 6BE6 Mixer
  • V3 (1/2) 6AQ8/ECC 85 HF Oscillator
  • V4 6BA6 1st IF Amp.
  • V5 6BA6 2nd IF Amp.
  • V6 6BE6 Product detector
  • V7 6AQ8/ECC 85 BFO, 1st AF Amp
  • V8 6AQ5 Audio Output
  • Optional OA2 Voltage Regulator
Dimensions and weight: 18 cm high, 38 cm wide, 26 cm deep. Weight 8 kg.
Power requirements: 220-240 and 110-120 VAC, 45 W.
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