Cayin HA-1A MK2 Tube Headphone Amplifier


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Background of HA1AmkII

Cayin first rose to prominence in the audiophile community with their tube amplifier, so it is natural to expect Cayin to release a tube headphone amplifier sometime.

The HA1A launched back in 2005 actually served that purpose already. With its unique form factor and innovative circuit layout, it has been one of the long term best sellers in Cayin’s line up. The renewed HA1AmkII will further reinforce the lead.

The Product Engineer, who designed the HA1A originally, decides to upgrade his original work after 10 years of hard learning. We certainly should expect a lot from the HA1AmkII because we were told that he puts Headphone output as his sole objective when he revives the classic. If you are looking for a warm and sweat sounding headphone amplifier, looks no further because your choice is at hand.


Design Highlight


l   Specially designed 5 steps output impedance selection offers precise matching to most headphones available on the market

l   Designed with commonly available vacuum tubes, allow tube rolling with compatible tubes from different brands and dates, users can fully appreciate the strength of tube amplification.

l   Dedicated implementation of single-ended amplification circuit offer simple, pure and devoted music presentation.

l   Extensive Power Management consideration with separated power supply to signal and voltage amplification, using power regulation tube further isolate the two stage power supply from each other, this can safety the components are operated at the best possible condition, and the audio performance will be significantly enhanced.

l   Equipped with Pre-out connection, making the amplifier can function as an audiophile grade tube preamp with paired with an active speaker or a power amplifier.

l   Two sets of Neutrik 6.35mm stereo headphone output work in parallel, Phone A set for Dynamic presentation, Phone B set for Soft presentation.

l   Design with an innovative circuit layout and highly effective shielding consideration, the components will function at premium environment to ensure high quality audio performance form the amplifier.


Key Features


l   Deploy EL84EH as power tube

l   Deploy 12AU7 as signal tube

l   Deploy NOS 12DT5 as power regulation tube

l   Deploy premium grade Z11 EI-core as power transformer

l   Deploy wide-band premium grade Z11 EI-core output transformer, the unique layer winding technique offer high quality and versatile at the same time

l   Deploy premium grade ALPS-27 rotary potentiometer as volume control

l   Optimised air duct cooling system to disperse heat out of the amplifier effectively, ensure the amplifier can work stably for long hours.

l   Deploy 3 independent supporting foot to optimize shock absorption and improve audio performance.



Headphone Output

Power Rating 1400mW+1400mW (@32Ω), 850mW+850mW (@64Ω)

1200mW+1200mW (@150Ω), 2000mW+2000mW (@300Ω)

2200mW+2200mW (@600Ω)

Frequency Respond 20Hz~45kHz ±3dB
THD+N 1%(1kHz)
Input Sensitivity 200mV~440mV
S/N 100dB (A Weighted)
Output Impedance 8~32Ω,33~64Ω,65~150Ω,151~300Ω,600Ω


Output Level 2V (MAX  4V)
Frequency Respond 10Hz~42kHz ±3dB
Input sensitivity 420mV
THD+N 0. 5%
S/N 100dB (A Weighted)


Input CD, AUX
Output PRE- OUT

126. 5mm x 304mm x 215mm  (LxDxH)

Tube Used 12AU7 × 2, EL84EH × 2, 12DT5 × 1

9. 5KG

Power Consumption 65W
Operation Condition Temp : 0℃~40℃ Humidity : 20%~80%
Storage Condition Temp : -20℃~70℃ Humidity : 20%~90%




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