Six Years On, the HA-6A Legacy Continues
The HA-6A MK2 is the long-awaited second-generation upgrade to Cayin’s
acclaimed HA-6A. Featuring a newly adopted dual-chassis architecture, it physically
separates the power supply from the amplification circuit to minimize magnetic
interference. With a fully hand-wired, point-to-point design, the HA-6A MK2 offers
pure signal transmission. All while preserving the lush, emotional sound Cayin is
known for.
Tube Configuration
At the core of the HA-6A MK2 are carefully selected and matched vacuum tubes,
including:
- 2 × JJ GZ34 / 5AR4 (High-voltage tube rectification
- 2 × JJ ECC82 / 12AU7 (Voltage amplification stage)
- 2 × Genalex KT88 (Class A single-ended power amplification)
Each tube was chosen for its acoustic character, stability, and longevity. The power
tubes operate in a pure single-ended Class A configuration, offering superb linearity.
Designed with tube enthusiasts in mind, the amplifier offers broad tube rolling
compatibility—supporting power tubes such as 6550, KT66, KT150, and more.
Dual Operating Modes: Triode & Ultralinear
To adapt the sound to various musical genres and listening preferences, the HA-6A
MK2 features two selectable operating modes:
- Triode Mode (TR): Smooth, elegant, and naturally warm. Ideal for vocals, jazz, and acoustic music.
- Ultralinear Mode (UL): Extended dynamics, firmer bass, and improved control—suited for orchestral or cinematic recordings.
Switching is easily accessible from the front panel, allowing for immediate real-time
listening comparisons.
Versatile Connectivity with Preamp Capability
- The HA-6A MK2 features a two set of input terminals:
- XLR Balanced Input
- RCA Unbalanced Input
A comprehensive set of headphone outputs
- 6.35mm Unbalanced
- 4.4mm Balanced
- 4-pin XLR Balanced
Accommodating a wide range of headphone types and connection preferences.
In addition to its headphone amplification duties, it also includes an RCA preamp
output, allowing it to function as a high-quality tube preamplifier when connected to a
separate power amplifier or active speakers.
Dual-Chassis Design
To maximize performance, the HA-6A MK2 adopts a separated power supply and amplifier chassis design. This architecture minimizes magnetic interference.
- Custom EI output transformers and a dedicated toroidal power transformer are specially developed for the HA-6A MK2.
- Internal component shielding and optimized module layout ensure low noise.
Remote Control & Protective Features
- High-grade aluminum remote control included for volume and mute functions
Specifications
| Parameter | Specification |
| Output Power (4-pin Balanced) | UL: 4500mW + 4500mW TR: 3000mW + 3000mW |
| Output Power (4.4mm Balanced) | UL: 1000mW + 1000mW TR: 650mW + 650mW |
| Output Power (6.35mm Unbalanced) | UL: 3500mW + 3500mW TR: 2300mW + 2300mW |
| Frequency Response | 10Hz – 26kHz (±3dB) |
| THD | 0.3% (1kHz @ 200mW) |
| Signal-to-Noise Ratio | 104dB (A-weighted) |
| Impedance Matching | 8Ω–600Ω (L/M/H selectable) |
| Preamp Output Voltage | 6V max |
| Preamp Gain | 20dB |
| Tube Complement | ECC82 ×2, KT88 ×2, GZ34 ×2 |
| Inputs | 1 × RCA, 1 × XLR |
| Preamp Output | 1 × RCA |
| Power Consumption | 130W |
| Dimensions (W × D × H) |
PSU: 160 × 297 × 185mm / AMP: 285 × 297 ×185mm |
| Net Weight | PSU: 8.2kg / AMP: 11.2kg |






















