Cayin HA-300 MK3 | Flagship Desktop Tube Headphone Amplifier

The HA-300 MK3 continues Cayin’s pure Class A, single-ended triode design, while making meaningful design upgrades in the circuit, transformer and power architecture

Direct Heated Triode Vacuum Tube Headphone/Speaker Amplifier
New Third-Gen Upgraded Circuit Design
GZ34 / 5AR4 Rectifier Tubes, Offering Wider Compatibility for Tube Rolling
Specially Optimized for IEM Compatibility
Upgraded Power Supply Section for Enhanced Stability and Lower Noise
Comprehensive Headphone Outputs, Inputs + Speaker Output


A Comprehensive Upgrade
As the third-generation model in the HA-300 series, the 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.
Pure Single-Ended Class A Design
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.
JJ GZ34 / 5AR4 Rectifier TubesThe HA-300 MK3 employs two JJ GZ34 / 5AR4 tubes and an upgraded tube rectification circuit delivering improved efficiency while preserving the distinctive appeal of tube-based power supply design.
JJ 6SN7 Voltage Amplification TubesThe 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.
Genalex Gold Lion PX300B Power TubesKnown for their warm, richly textured character, these tubes deliver a full, delicate midrange, smooth, transparent highs, and deep, well-controlled bass.

Third-Gen Circuit Upgrade
The HA-300 MK3 adopts a physically separated power supply and main amplifier chassis, providing cleaner energy delivery and improved isolation from interference. The voltage amplification stage incorporates a low-noise regulated circuit with independent staged power delivery, preserving the integrity of the original audio signal. 
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.
Refined in Every Detail
The updated transformer housing design removes the previous aluminum decorative plates, resulting in a cleaner, lighter visual appearance and improving heat dissipation. For improved wear resistance and reduced fingerprint visibility, the HA-300 MK3 chassis is finished with a fine sandblasted texture. A newly designed family-style tube cage replaces the previous design, providing stronger protection.
Premium Components + Features
Third-Generation Custom TransformersThe HA-300 MK3 is equipped with a third-gen wide-bandwidth EI output transformer and toroidal power transformer, developed specifically for this model. These transformers provide significantly improved shielding and reduced noise interference.
DUELUND Coupling CapacitorsThe headphone amplifier uses DUELUND coupling capacitors from Denmark, widely regarded as an ideal match for tube amplifiers. Their low distortion and excellent transmission characteristics enhance detail and layering.
New Gold-Plated Tube SocketsNew premium gold-plated tube sockets provide better conductivity and more stable contact than conventional ceramic gold-plated pin sockets. 
60-Second Startup DelayA 60-second delayed mute function allows the amplifier to warm up properly after power-on, helping it reach optimal operating condition before playback begins.

Specifications


Dimensions

Power Supply: 6.26" x 13.58" x 8.07"
Amplifier: 11.26" × 14.49" × 8.07"



Weight

Power Supply: 22 lbs
Amplifier: 37 lbs


Full list of specifications