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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