As the third-generation model in the HA-300 series, the Cayin HA-300 MK3 builds on the acclaimed architecture of the MK2 with major advances in components, circuitry, craftsmanship, and industrial design. From sonic refinement to day-to-day usability, every detail reflects Cayin's ongoing pursuit of acoustic excellence.

The HA-300 MK3 continues the series' classic single-ended pure Class A tube amplifier design, combining premium tubes with a newly upgraded circuit to achieve an exceptional balance of musicality and technical performance.

The HA-300 MK3 employs two JJ GZ34 / 5AR4 rectifier tubes and an upgraded tube rectification circuit, delivering improved rectification efficiency while preserving the distinctive appeal of tube-based power supply design. It is also compatible with a selection of equivalent rectifier tubes, giving users the freedom to tailor the amplifier's sonic presentation through tube rolling and enjoy a more personalized listening experience.

Please note that the HA-300 MK2 and HA-300 MK3 feature different power supply designs and are not compatible as standard.

The JJ 6SN7 tubes provide low noise and high resolution, enabling accurate voltage gain and excellent detail retrieval while laying a clean foundation for the subsequent amplification stages.

The HA-300 MK3 uses Genalex Gold Lion PX300B tubes in a Single-ended pure Class A output stage. Known for their warm, natural, and richly textured character, these tubes deliver:

• Full and delicate midrange
• Smooth, transparent highs
• Deep, controlled, and elastic bass

The result is a presentation that preserves the emotional core and natural beauty of music.

The HA-300 MK3 adopts a physically separated power supply and main amplifier chassis, providing cleaner energy delivery and improved isolation from interference.

Built around a new third-generation upgraded circuit, the amplifier retains the unique charm of Cayin's classic single-ended tube topology while enhancing signal transmission efficiency and anti-interference performance.

The voltage amplification stage incorporates a low-noise regulated circuit with independent staged power delivery, preserving the integrity of the original audio signal and reproducing music with greater precision and realism.

In addition, the HA-300 MK3 has been specially optimized for IEM compatibility, making it suitable for a much wider range of headphones than before.

With greatly expanded compatibility, the HA-300 MK3 offers a wider sensitivity and power range, enabling it to drive everything from low-impedance IEMs to high-impedance full-size headphones. It is engineered to satisfy diverse listening needs with precision. At the same time, key acoustic specifications have been further improved, delivering cleaner signals, finer detail retrieval, and a more immersive listening experience.

All tubes used in the HA-300 MK3 can be replaced with compatible alternatives, giving users the freedom to tailor the sound signature to their own preferences and listening scenarios.

From subtle tonal refinement to dramatic changes in presentation, tube rolling opens the door to a wide range of sonic possibilities and a more personalized listening experience.

For more detailed information, please refer to the Tube Substitution section in the manual.

The amplifier features a full range of headphone outputs, including:

• Neutrik 4-Pin XLR balanced
• 6.35mm single-ended
• 4.4mm balanced

All connectors use high-quality components to ensure reliable contact and low signal loss. 

It also provides High / Medium / Low impedance selection, allowing precise matching with different headphone types and ensuring optimal performance across a wide range of loads.

The HA-300 MK3 also offers:

• 1 pair of XLR balanced inputs
• 1 pair of RCA single-ended line inputs
• 1 set of speaker output terminals

In addition to driving headphones, the amplifier can also power speakers, making it suitable for both desktop audio systems and home listening setups.