HA-3A

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
 

HA-3A

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.
 

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.

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.

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.

In-house Designed Premium
Power Transformers

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 
condition.

High Quality Volume Control

High performance 50KA*2 Dual Unit smooth 
potentiometer from ALPS offers durable, 
high-precision volume control with excellent 
operational fee.
 

Anti-inference Design

Special shielding and anti-shock design removes
microphonic effectively.
 

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.