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Marantz PM-KI Ruby Integrated Amplifier

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The Marantz PM-KI Ruby Amplifier is a special edition amplifier released to celebrate Brand Ambassador Ken Ishiwata's 40 year association with the company. The Signature KI Ruby amplifier draws on over 65 years of Marantz expertise, featuring discrete two-stage design, MM/MC phono stage and the laser-engraved signature of Ken Ishiwata.


The PM-KI Ruby Amplifier has been designed, engineered and extensively tuned by a select team headed by Ken Ishiwata, using all the design knowledge from his 40 years at Marantz. The PM-KI is constructed from a vibration resistant double layer chassis providing rigidity, with a 5mm thick aluminium top plate, and solid aluminium front panel. The casing is completed with a copper plated chassis and massive insulators, ensuring all unwanted vibrations are dampened sufficiently. High quality nickel plated input terminals and high purity copper speaker connections provide highly conductive, effective connections.

Main Amplifier

The current feedback circuitry in the PM-KI Ruby has newly developed wide-range circuitry, coupled with a toroidal transformer dedicated to the preamp, to produce both power and clarity in the sound. Marantz HDAM SA3 circuitry offers clean signal paths and optimal dynamics to deliver 100 watts per channel into 8 Ohm speakers or 200 watts into 4 Ohms speakers. The PM-KI Ruby uses a switching power amplifier design directly derived from the flagship PM-10 model. Discrete components give optimal quality for the signal path, with active and passive RIAA equalisation components split. The Class A amplifier runs at minimum distortion with all discrete components.

Phono Stage

The phono stage of the PM-KI Ruby delivers premium sound through optimised simplified signal paths. The phono stage is designed to work with Moving Magnet and Moving Coil cartridges, thanks to a built-in MC head amplifier. All possible distortion is lowered by using two stage amplification, which combines Marantz HDAM with Junction Gate Field Effect Transistors for high input impedance. This configuration lets the no negative feedback design be simpler, by not requiring coupling capacitors, enhancing signal purity whilst separate power supplies for the preamp and power amp reduce interference. In keeping with the all discrete design of the amplifier, the dedicated headphone amplifier features all discrete construction with HDAM-SA2.


On the front panel of the Marantz PM-KI Ruby is Ken Ishiwata’s engraved signature, accompanied by a special ruby motif to mark Ken Ishiwata’s 40 Year career at Marantz. The PM-KI Ruby is available in a limited run in Black or Gold finishes.

More Information
Manufacturer Marantz
Free warranty 3 years
Delivery Charge Free
Delivery Time 1 - 5 Working Days
Card Surcharge No
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Channels 2
Current Feedback Topology
High Grade Audio Components
Customised Components
Symmetric PCB Layout
Aluminium Extrusion Heat Sink
Balance / Bass / Treble
Linear Drive Power Supply
Linear Volume Control
Double Layer Bottom Plate
Low Noise OLED Display
Source Direct
Power Amp Direct
Standby Mode
Phono EQ Marantz Musical Premium Phono EQ
System Block Shielding Copper
HDAM Version SA3, SA2
Power Transformer Toroidal

Inputs / Outputs
Audio Inputs 6
Phono Input MM / MC
Marantz Musical Premium Phono EQ
Floating Control Bus (3.5 mm mono jack x 2)
Headphone Out
Audio Outputs 2
Number of Terminals 2

Power Output (8 / 4 Ohm RMS) 100 W / 200 W
Frequency Response 5 Hz-50 kHz
Total Harmonic Distortion 0.01%
Damping Factor 500
Input Sensitivity: MM 2.3 mV / 39 kOhm
Input Sensitivity: MC 250 µV / 100 ohm
Signal to Noise Ratio: MM/MC 88 / 75 dB
Input Sensitivity: High Level 220 mV / 13 kOhm
Signal to Noise Ratio: High level 107 dB (2V input)
Input Sensitivity Power Amp Direct IN    1,1V / 13 kohm

Aluminium Front Panel
Auto Power Off
System Remote Function
Detachable Power Cable
Power Consumption 130 W
Standby Consumption 0.2 W
Remote Control RC005PMSA
Maximum Dimensions (W x D x H) 17.32 x 17.83 x 5 "
Weight 34.61 lbs
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