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The CS-55A is the most recent advancement in tube amplifier technology created by Cayin. This state-of-the-art machine boasts 40 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 giving a wide range of options for any listener.

Transform your music system! Extraordinary value and performance best describes the Cayin Audio CS55A Integrated amplifier. As the centre piece of any system, the unit is at home with both analogue or digital formats. 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. This combination of a high end DAC and tubes makes for a rich and detailed soundstage.

The output stage can be switched between Triode and Ultra Linear mode and either KT88 or EL34 tubes can be used for the maximum amount of flexibility. A headphone jack on the front completes the unit and makes this one of the most versatile and compelling products on the market.


SKU: CS55ADK Category:


Cayin – CS-55A

Technical Specifications

Power output

KT88 tube: Triode 22W – Ultra Linear 40W
EL34 tube: Triode 20W – Ultra Linear 38W


USB, CD, AUX and Phono (MM)

S/N Ratio


Power usage



360mm × 334mm × 180mm (WxDxH)


17 kg


This week we reviewed the Cayin CS-55A KT88, a tube amplifier priced at €1790 featuring analog inputs as well as a digital USB input for audio streaming up to 32-bit / 384kHz from a computer.

Read the review here >

Son-Video (Blog review)

A great sounding tube integrated amp! Cayin CS-55A review.
This unit was sent to me by the Canadian distributor for review but I actually have bought one before that.

Read the review here >

Thomas & Stereo (Youtube)

Cayin CS-55A Tube Integrated Amp
We review the amazing Cayin CS-55A Integrated Tube Amp.
“The Cayin CS-55 is a BIG thumbs up and first impression is amazing”

Read the review here >

Audio Excellence Canada (Youtube)