Cayin CS-55A Tube Integrated Amp & USB DAC

The CS-55A is the most recent advancement in tube amplifier technology created by Cayin. It boasts forty watts per channel by using 4 KT88 tubes in Class AB ultra-linear push pull amplification. The CS-55A consists of four pairs of input: one Phono, a USB port, and two line inputs.
The CS-55A comprises of a fully anodized aluminum front, a vented chassis and a soft-start circuit to enhance the life of the toroidal power transformer and output transformers. Speaker output impedance can be swapped between 4 ohms and 8 ohms. Similarly to the A-88T, the CS-55A comes with a handy remote control.
The CS-55A includes a built in MM phono section to accommodate turntables and a built-in high resolution DAC for use with computers. Via the 2.0 USB input, the DAC is capable of covering digital audio signals up to 32bit | 384kHz.
The output stage can be switched between Triode and Ultra Linear mode and either KT88 or EL34 tubes can be used.

Power Output
KT88: 22W Triode – 40W Ultralinear
EL34: 20W Triode – 38W Ultralinear
Frequency Response
KT88: 5Hz – 44kHz (-3dB)
EL34: 5Hz – 48kHz (-3dB)
Input Terminal
USB, CD, Phono, Aux
Power Consumption
S/N Ratio
Input Sensitivity
KT88: 270mV
EL34: 280mV
360mm × 334mm × 180mm
Net Weight
Output Impedance
Input Impedance
Tube KT88: 4 x KT88, 2 x 12AU7/ECC82, 2 x 12AX7/ECC83
EL34: 4 x EL34, 2 x 12AU7/ECC82, 2 x 12AX7/ECC83