Cayin HA-300B Mk. III

This is the 3rd generation of Cayin's flagship 300B amplifer for speakers, headphones, or IEMs with an upgraded circuit design.

Two JJ GZ34 / 5AR4 rectifier tubes are used with an upgraded tube rectification circuit for improved rectification efficiency while preserving the distinctive appeal of tube-based power supply design. The JJ 6SN7 Voltage Amplification Tubes provide low noise and high resolution, enabling accurate voltage gain and excellent detail retrieval.

Finally the Genalex Gold Lion PX300B tubes known for their warm, natural and richly textured character preserves the emotional core and natural beauty of music.

A physically separated power supply chassis and low-noise regulated circuit with independent staged power delivery provides cleaner energy delivery and improved isolation from interference. A 4.4mm balanced output has been specially optimised for IEM compatibility, delivering a more detailed and immersive listening experience across a wider range of devices from low-impedance IEMs to high-impedance full-sized headphones.

The HA-300 MK3 continues Cayin’s pure Class A, single-ended triode design, while bringing meaningful upgrades in circuit design, transformer performance, power supply architecture, component selection, and overall craftsmanship. The result is a more refined, more stable, and more versatile flagship amplifier, with improved compatibility across a wider range of headphones, from sensitive IEMs to full-size high-end models.

// HIGHLIGHTS:

• Upgraded power supply section for enhanced stability and lower noise
• Uses GZ34 / 5AR4 rectifier tubes, offering wider compatibility with a variety of alternative tubes for tube rolling
• Third-generation wide-bandwidth EI output transformers
• Third-generation toroidal power transformer
• Premium DUELUND coupling capacitors from Denmark
• Low-noise regulated voltage amplification stage
• Classic point-to-point hand wiring
• Balanced and single-ended headphone outputs
• RCA and XLR inputs
• Speaker output terminals
• High / Medium / Low impedance matching
• Refined new family-style industrial design with upgraded finish and detailing

The HA-300 MK3 comes equipped with:

• 2x Genalex Gold Lion PX300B power tubes
• 2x JJ 6SN7 Voltage Amplification tubes
• 2x JJ GZ34 / 5AR4 Rectifier tubes

// OTHER SPECIFICATIONS
- Headphone Output (4-pin XLR BAL): 6500mW+6500mW
- Headphone Output (1/4" / 6.3mm SE): 6000mW+6000mW
- Headphone Output (4.4mm BAL): 1600mW+ 1600mW, specially optimized for IEMs
- Headphone Output TH+D: <1% @ 1kHz, 1500mW; Rated Output Power <5%
- Speaker Output: 8W + 8W
- Speaker TH+D: <1% @ 1kHz, 3W; Rated Output Power <5%
- Input Connector: 1 set XLR, 1 set RCA
- Dimensions: 159 x 345 x 205mm (power supply), 286 x 368 x 205mm (amplifier)
- Weight: 10kg (power supply), 16.8kg (amplifier)