Transformer Coupled, Balanced Driven
Vacuum Tube Headphone Amplifier
4-Pin XLR, 4.4mm, and 6.35mm Headphone Output
~A4 Footprint, Desktop Friendly Design
Low, Mid, High Impedance Matched Headphone Outputs
When exquisite design accomplished
by first class engineering,
when aesthetic backed up
by rigorous production.
The HA-3A vacuum tube headphone
amplifier let you enjoy your beloved
music through your choice of headphones
or earphones in a dedicated, engaging,
and indulging retreat.
HA-3A might look compact and simple,
but Cayin has devoted our renowned
engineering, decades of audio
equipment manufacturing and carefully
selected performance-based components
to make this happen.
with Minumum Interference
HA-3A uses an RCA 25AX4GT as rectifier tube, one of
the best versions of 25AX4GT available in tube market.
While converting imcoming power source to DC
current the 25AX4GT rectifier tube minimises
interference and provides clean power to
the amplification circuit.
Carefully Selected and
Hand-matched Vacuum Tubes
Dual 12AU7/ECC82(Matched Pair) from JJ*
Dual 6V6GT（Matched Pair）from Electro Harmonix*
Single-ended Vacuum Tube Circuit
The HA-3A vacuum tube amplification is designed as
a 2-stage single-ended circuit.
The 12AU7/ECC82 driver tubes will amplify the
voltage level of the incoming audio signal so that
the 6V6 output tubes will perform its amplification
at a very linear condition.
Single-ended circuit design displaces the beautiful
tone of your vacuum tubes without any cancellation.
Single-ended uses matched pair instead of matched
quad-set tubes, you can enjoy greater flexibility when
you perform tube rolling.
Transformer-coupled, Balanced Driven
The 6V6 output drives a pair of proprietary output
transformers that supports single-ended and balanced
The secondary winding of the output transformer
provide an alternative phase and compose a balanced
output, enables balanced driver from a single-ended
vacuum tube amplification circuit.
Both single-ended and balanced headphones are
“original” outputs from the transformers.
Our engineers have optimized HA-3A’s output to
handle the headphone loading according to three
headphone impedance settings:
Low: 8Ω ~ 64Ω
Medium: 65Ω ~ 250Ω
High: 251Ω ~ 600Ω
4-Pin XLR Balanced
The 4-Pin XLR output is a full-fetched output but
the 4.4mm output is optimized for wider range of
headphones,including high sensitivity portable
The Hidden Details
The chassis and transformer pots are treated by
our proprietary 14 rounds of crafting process
composed of scratch, spray, sanding and baking.
The high gloss final finishing endows a refined and
delicate texture as well as protecting the amplifier
during years of long service.
Balanced (XLR) and Single-ended (RCA) to cover
a variety of inputs.
Balanced input will go through a pair of input
transformers, the + and - half cycle will merge to
become a single-ended signal.
Time consuming, shortest signal path, better
attention to detail, the entire circuitry is
handwired by skillful craftmen.
Implement circuit design with high-level of
transparency and refinement, improves
overal efficiency and conductivity.
In-house Designed Premium
Cayin always design, wind and use high inductance,
high efficiency power transformers in our products.
Reinforcing shielding design minimizes the interference
and noise while ensure HA-3A to work in the best
High Quality Volume Control
High performance 50KA*2 Dual Unit smooth
potentiometer from ALPS offers durable,
high-precision volume control with excellent
Special shielding and anti-shock design removes
Three XL Aluminum Foot Pads
A set of three 39x18mm XL shock-absorbing
aluminum foot pads to provide firm and stable
amplifier placement at any hard flat surface.
2-rear & 1-front self-levelled placement to handle
the extra weight on the back of the amplifier
due to the power and output transformers.