Cayin HA-3A Tube Headphone Amplifier

Features

• Transformer-Coupled, Balanced-Driven Vacuum Tube Headphone Amplifier
  Indicates transformer coupling and a design that supports balanced driving. 

• Headphone Outputs:
  Includes three output connectors: 4-Pin XLR, 4.4 mm Balanced, and 6.35 mm (¼″) Single-Ended.

• Compact, Desktop-Friendly Design:
  Has an ~A4 footprint, making it suitably sized for desktop setups.

• Impedance-Matched Headphone Outputs:
  Features three impedance settings—Low, Medium, and High—to match a wide range of headphone impedances.

• Premium Build Aesthetic with Fine Engineering:
  Described as combining "exquisite design accomplished by first-class engineering" with aesthetics backed up by rigorous production.

• Clean Power with Minimal Interference:
  Utilises an RCA 25AX4GT rectifier tube (noted as “one of the best versions of 25AX4GT available in tube market”) to convert incoming power to DC, minimizing interference and providing clean power to the amplification circuit.

• Hand-Matched Vacuum Tubes:

  • Driver Tubes: Dual 12AU7/ECC82 (matched pair) from JJ

  • Output Tubes: Dual 6V6GT (matched pair) from Electro-Harmonix

  • 2-Stage Single-Ended Vacuum Tube Circuit:
    The driver tubes amplify the voltage level so that the output tubes can perform amplification in a highly linear condition. The single-ended design avoids cancellation of the tube tone and enables flexible tube rolling using matched pairs instead of quads.

• Transformer-Coupled Balanced Output from Single-Ended Architecture:
  Proprietary output transformers support both single-ended and balanced headphone outputs. The secondary winding provides an alternate phase to generate a true balanced output, directly from the transformer secondary windings.

Specifications

Amplifier

• Input Connector: XLR ×2, RCA ×2

• Tube:

  • Output: Electro Harmonix 6V6GT ×2

  • Driver: JJ 12AU7/ECC82 ×2

  • Rectifier: RCA 25AX4GT ×1

• Dimension: 306 mm × 260 mm × 170 mm

• Net Weight: 12 kg

• Fuse:

  • ~220V–240V: T1 AL250V

  • ~100V–120V: T2AL250V

• Output Tube Fuse: T1 25mAE250V

• Power Consumption: 80 W

• Working Condition: Temp: 0 °C ~ 40 °C; Humidity: 20%–80%

Headphone Output

• Rated Output (per channel):

  • 4-Pin XLR (Balanced):

    • Low: 600 mW

    • Medium: 750 mW

    • High: 850 mW

  • 4.4 mm (Balanced):

    • Low: 230 mW

    • Medium: 350 mW

    • High: 400 mW

  • 6.35 mm (Single-Ended):

    • Low: 400 mW

    • Medium: 600 mW

    • High: 700 mW

• Frequency Range: 18 Hz ~ 30 kHz ±3 dB

• THD+N: 0.2% (1 kHz, 200 mW)

• Sensitivity: 300 mV ~ 480 mV

• S/N Ratio: 100 dB (A-Weighted)

• Headphone Impedance:

  • Low (L): 8–64 Ω

  • Medium (M): 65–250 Ω

  • High (H): 251–600 Ω

• Headphone Connector: 4-pin XLR ×1, 4.4 mm ×1, 6.35 mm ×1