In the Robert Koda tradition of technical elegance, dynamic simplicity within the circuit operation and meticulous assembly comes our new and flagship pre-amplifier, Takumi K-15.
The K-15 presents a new level of State of the Art and renders music as a fresh encounter of a most indulgent and satisfying kind. Specifically designed to partner with a wide range of source components and power amplifiers, its purpose to extract the maximum performance from each component so that the system as a whole will deliver uncharted musical pleasure.
While this brochure highlights some of the methods we used to create the K-15, there can be no substitute for a personal encounter with this magnificent instrument.
Our invention and a unique arrangement of semi-conductors called ITC was pioneered in the multiple award winning K-10. Now ITC is taken beyond the next level with K-15 – Dramatically improved and refined in both design and execution it achieves better subjective and measured results.
The ITC circuit provides an excellent interface between source component and power amplifier. It delivers massive power gain with remarkably low distortion while remaining highly immune from the negative influences of power supply sound.
The circuit is elegant, simple, unflappable and totally effective over a dynamic range in excess of a hundred and forty decibels. It is the ideal pre-amplifier engine and uniquely Robert Koda.
Critical in its central role to final sonic outcome, K-15 uses a volume control system of unexpected extravagance and depth of quality. A massive custom built eight channel switch is used to form the basis for this balanced mode volume control.
While some 256 nude resistors of the finest audio grade, fabricated specifically for this purpose are included, only two per channel phase are used at any one time with this L-Pad configuration.
The switch itself maintains perfect contact pressure while the contacts are solid silver and of a generous proportion. All aspects of construction are of the highest order. The final result is quite evident in the listening experience.
The power supply is retained within the K-15 main chassis and avoids the need for extra wiring looms. The optimal; a fully annealed Permalloy magnetic shielding solution is instead chosen. The natural way of the ITCs workings enables the K-15 to produce both balanced and unbalanced output options without compromise. All technical and sonic attributes are identical, allowing for the best possible choice of connection to the associated power amplifier.
To extract the highest performance from the source components the K-15 provides a very stable and non reactive termination for both balanced and single ended sources. Each input signal type is treated as native with no conversions required before application to the main amplification block within K-15. Gold plated inserts and a ruby lens finish the simple yet luxurious exterior. Packed in a sturdy flight case, built and tested with a spirit to perfection, the Takumi K-15 is our vision of the ultimate pre-amplifier.
Gain : Plus 8dB
Output impedance : 60 ohm single ended, 2X 30 ohm balanced
Input impedance : 50K ohm single ended, 2X 50K ohm balanced
Signal to noise : 114dB 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 : 29Kg unpacked
Size : 389mm wide, 385mm deep and 158 high excluding feet