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Cayin C9 Portable Vacuum Tube Amplifier

Cayin C9 Portable Vacuum Tube Amplifier

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<< Cayin C9-Portable New Generation >>
Cayin has been deeply involved in the audiophile audio market for nearly 30 years, and is committed to the development of breakthrough and high-quality products, which have been unanimously praised by audiophiles all over the world. Cayin’s main products all have common features, combining the vacuum tubes that represent traditional audio with modern technology to form a unique product series.
The obsession with good voices always encourages Cayin to bring forth new ideas. Therefore, in the ever-changing era of high-end players, the factory launched an index product that fits the market direction, the portable vacuum tube ear expander C9.

See the micro-knowledge-micro-scale expansion structure
The circuit design of C9 seems to be simple, but in order to pursue a stronger sound performance, the factory uses carefully selected parts and circuit working methods to cooperate with each other in the design and establishment of the entire signal circuit to overcome the volume and work. The environment and portability need to be extended.
On C9, the factory used two sets of Nutubes to achieve a balanced design, and added a negative feedback circuit design for them.
This design effectively suppresses the internal noise of the circuit, reduces the distortion rate, and at the same time enhances the stability of the circuit, so that the total harmonic distortion of the C9 Nutube can be reduced to 0.03%. This improvement makes the C9's vacuum tube mode have a good sense of speed and transparency, and achieve unprecedented performance in terms of sound transients, extensions and details.
For the tone of the transistor, C9 uses a pair of Toshiba 2SK209 to build the circuit. The timbre is relatively more balanced, and emphasizes the clarity and control of the sound. The timbre is refreshing and bright. It is a design that pursues rhythm and strength.
In terms of amplifier circuit, Cayin designed the circuit in a fully discrete type, carefully fine-tuned the matching of each part, so that C9 has very good load flexibility. For many users who use different systems, this design is more suitable for matching headphones. For loose. The factory uses a four-way metal package LSK489 JFET with a parallel triode combination, which has stable circuit performance and high current driving force to ensure that it can control all types of headphones. By changing and setting the bias current, users can set the amplifier circuit to Class A/Class AB to create a sound that is more suitable for personal listening habits.
Another key point is the power supply design of C9. The factory uses four Sony 18650 batteries to form a power supply module, with a continuous power supply current of 30A, which is connected in series to form a positive and negative DC power supply. The batteries are paired after precision testing, and directly supply power to the amp circuit without any DC/DC conversion, providing excellent dynamic performance and quiet power supply for the audio amplifier circuit; C9 uses nearly two hundred different parts at the same time to form a scale Huge power filter decoupling circuit, and try to shorten the length of the circuit, and further reduce the dynamic impedance of the power system, so that the dynamic impedance of the audio signal at each frequency tends to be close and consistent.
In order to solve the problem of unbalanced left and right channels when the analog potentiometer is low in volume, and at the same time have a perfect feel, the volume control of C9 is designed in two ways, analog and electronic, and the ALPS volume potentiometer is used as the physical position detection of the knob. , And then the microcontroller controls two MUSES72320 high-precision volume ICs to achieve four-channel volume control.
C9 has a unique Pre-in mode in the portable market. In this mode, the output of the C9 will be locked at the maximum volume and cannot be adjusted, and a front end with pre-out or line-out volume adjustment is required. By bypassing the volume control in the camera, the C9 in the pre-level mode can show a deeper sense of space and a darker background, and the overall performance is better. 

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