Monday, July 11, 2011

Robert Koda ultimate high-end audio preamplifier Takumi K-10


Here a few highlights from K-10

Innovative design meets meticulous execution

The K-10 pre-amplifier   is crafted wi th met iculous attent ion  to one purpose,  musical excellence. Each element is carefully engineered to deliver the highest possible performance without compromise to concerns of cost or practicality. Form truly does follow function.

Unnecessary complication is avoided at every turn to protect the precious music signal from adverse influences.

Simple, finely crafted mechanical controls

The K-10 uses the finest attenuator part available for volume control. Perfectly hand assembled in Japan, this attenuator uses exotic resistors solely created for sound reproduction. Comprising of a special carbon formulation with thick gold over oxygen free copper leads, these parts are of ultimate choice.
Source selection is performed by a rotary switch built specifically for the most demanding of audio applications. Thus all manner of relays, complex support circuitry and sound destroying printed circuit board tracks have been eschewed entirely.

DC Reactor power supply

To decouple the K-10’ s performance from impure AC supply lines we have adopted a heavy DC Reactor type power supply that delivers valuable advantages over other types of supply. The reactor’ s performance is further enhanced by the use ofour own designed for audio, discrete zero feedback regulator to provide the amplifier with pristine DC current.

Triple screened chassis

A robust chassis creates a full copper envelope surrounding all components of the K-10 to shield them from the influences of external electromagnetic and radio frequency interference.  Sensitive components within the ITC gain stage are further shielded by “double encapsulation” – a separate copper shell and a custom made mu-metal capsule within.  The power supply  is housed  in  i ts own  “magnet ic vaul t ”  made of  2mm  thick soft   iron plate.  A sandwich  f loo r  const ruct ion with constrained layer damping and hemispherical sorbothane feet provide additional isolation from unwanted vibrations.

Electrically, thermally and acoustically this lavish assembly sets an excellent operating environment for the enclosed electronics.

Single ended and balanced output of equal performance

Providing single ended and balanced outputs of identical performance presents a challenge to pre-amplifier designers. The K-10 is successfully engineered to deliver both at full measure, affording a greater flexibility for system configuration.


Inputs    SE X3 pairs True balanced X1 pair
Outputs SE X 2 pairs True balanced X 1 pair
Gain   Plus 6dB
Output impedance 75 ohm single ended, 2X 37 ohm balanced
Input impedance 50K ohm single ended
Signal to noise 110dB A weighted at 1V
Frequency response 20Hz to 20KHz +/- 0.03dB
Distortion 0.00003 % @ 1Khz at 2.5V into 100K ohm Estimated due to measurement limits.
Power consumption Off – 0W  On – 30W
Weight 27Kg unpacked
Size 380mm wide, 380mm deep and 170 high

User Manual