Tube type preamplifier with reliable tube C3g. High ability to eliminate common mode noise due to noise processing technology based on power supply development. Provides a noise reduction effect.

Stereo Preamplifier C3PR


Equipped with C3g

Equipped with the ultra-reliable C3g developed by Deutsche Telekom for telephone repeaters. The thin grid lines and large distance between electrodes enable high linearity amplification. The C3g is soldered directly onto the board to reduce noise at the contact point.


Proprietary transformers

Proprietary transformers are used for the input and output. The transformer is an important part that influences the performance of distortion, S/N ratio and input/output impedance. Therefore, the core material, wire material, winding thickness, and winding ratio are meticulously designed and manufactured.


Power supply for each left and right

Independent power supplies deliver power to the left and right channels as well as control circuits. Using all of the characteristics of the components together, we are able to preserve silence.


Resistance switching ladder attenuator

In a variable resistor that slides on a resistor, noise is generated by a point-contact diode, which can be a source of distortion. This unit is a crossbar twin structure. A gold and platinum contact relay switches the resistance and attenuates from 0 dB to -60 dB.





Vacuum tube stereo preamplifier

Frequency Response

20 Hz-20k Hz +0-1 dB

Max. Input Voltage

4 V/1k Hz

Max. Output Voltage

4 V/1k Hz


0.05%/1k Hz 250 mV

Signal to Noise Ratio

80 dB/ATT 0 dB, 100 dB/ATT -20 dB


16 dB

Min. load Impedance

600 Ω

Input Terminal

Balanced x2, Unbalanced x4

Input Impedance

7k Ω or more

Output Terminal

Balanced x2, Unbalanced x2

Output Impedance

50 Ω or less

Balance Adjustment

±3.5 dB


+2 dB 3 Steps 100 Hz

Remote Control

Infrared transmitter

Power Supply

AC100/120/200/240 V, 50/60 Hz

Power Consumption

30 W


470W×90H×400D mm


14 kg


Anodised aluminium


AC cords, Remote control, microUSB cable for charging

Warranty Period

5 years

  • Please use a pre-stage equipment with an output impedance of 1.5k Ω or less.
  • Dimensions do not include legs, knobs, and terminals.
  • The descriptions are current as of March 31, 2023.
  • The appearance and specifications are subject to change without notice.
  • Actual colors may differ from those in the photographs due to shooting, lighting, etc.

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