- Stereo Preamplifier
C3PR
- Full-scale preamplifier with resistor-switching ladder type attenuator equipped with ultra-reliable C3g tube. It eliminates common-mode noise and also provides noise reduction effect for the front stage equipment.
- Two-stage with C3g
- Uniquely transformer
- Resistance switching attenuator
Features
- Two-stage with C3g
- Equipped with the ultra-reliable C3g, developed by Deutsche Telekom. The thin grid lines and large distance between electrodes enable high linearity amplification. Using only two tubes of amplification, harmonics and mixed-modulation distortions are suppressed though no-feedback.
- Uniquely transformer
- True balanced transmission can only be achieved with a transformer. The C3PR uses transformers for input and output to enable fully balanced transmission. This transformer is a key component that determines performance in terms of distortion, signal-to-noise ratio, and input impedance, and is an integral part of the C3PR's circuitry. The core material, wire material, winding thickness, and winding ratio are carefully designed and manufactured to affect performance such as distortion, S/N ratio, and input/output impedance.
- Independent left and right doubly regulated power supplies
- Power supplies for the left and right channels and control circuits are all provided independently. Rectifiers used in general power supplies and contacts are noise sources. These are sharp-rising noises that span from 50 Hz to several hundred MHz and muddy the sound. C3PR regulates all power supplies, including multi-stage isolation from the AC line.
- Resistance switching attenuator
- In a variable resistor with a structure in which the contacts slide over a resistive element, a point-contact diode is formed at the contact point. When an audio signal passes through this point, noise is generated and becomes the basis of distortion. The C3PR switches the resistor ladder and attenuates from 0 dB to -60 dB by a highly reliable relay with gold and platinum contacts in a crossbar-twin-construction.
Specification
Model C3PR
Type 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
THD 0.05%/1k Hz 250 mV
Signal to Noise Ratio
80 dB/ATT 0 dB 100 dB/ATT -20 dB
Gain 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
Compensator +2 dB 3 Steps 100 Hz
Remote Control Infrared transmitter
Power Supply AC100/120/200/240 V, 50/60 Hz
Power Consumption 30 W
Dimensions 470W×90H×400D mm
Weight 14 kg
Finishing Anodised aluminium
Accessories 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 January 2025.
○ The appearance and specifications are subject to change without notice.
○ Actual colors may differ from those in the photographs due to shooting, lighting, etc.
