Clean Power
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
Driver Tubes
Dual 12AU7/ECC82(Matched Pair) from JJ*
Output Tubes
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
headphone outputs.
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.
Impedance Matched
Phone Output
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
Carefully Optimized
Headphone Outputs
6.35mm Single-ended
4.4mm Balanced
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
headphones.
Dual Inputs
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.
Point-to-Point Wiring
with Craftmanship
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.
Anti-inference Design
Special shielding and anti-shock design removes
microphonic effectively.
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