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Woo Audio WA33

The formidable WA33 tube headphone amplifier from Woo Audio, their new flagship in a legendary line of products. Bone-crushing power and deft control with all the tube sweetness coveted by hi-fi connoisseurs. If you want to reach the finish line, it lies right here.


WA33 Fully Balanced Headphone and Pre Amplifier
All-tube Design, Class-A
Output Transformer Coupled

In 2009, we introduced two world-class fully balanced headphone amplifiers – the WES electrostatic amp and the WA22 dynamic amp. Both are preferred choices among the most discerning audiophiles. Here at Woo Audio, we have been constantly push the performance boundaries. The newly developed WA33 is a state-of-the-art fully balanced headphone amplifier that raises the bar in setting a new reference in music reproduction.

The WA33 employs a true fully balanced design in a compact form factor, featuring a quad of 6C45 tubes for the driver that pushes a quad of 2A3 tubes for the power, in an all-tube design. It delivers high power to drive demanding headphones to their full potential while maintaining a low noise floor for use with highly sensitive models. The WA33 shares the same striking appearance of the critically acclaimed WES where both amplifier units are independent of the power supply. This approach eliminates any interference to critical audio components. Additionally, our internal coupling architecture (ICA) technology allows the WA33 amplifier to merge with the power supply unit without an external umbilical cord. The ICA shortens the signal path and thus significantly reduces unwanted electrical interference and raises sound performance to a level beyond what anyone has experienced in a headphone system.

The WA33 reveals the most delicate detail with the highest level of refinement. Complex music passages are handled with ease and authority. The expansive soundstage, holographic imaging, and rich tones that are pristine, natural, and vivid create a sense of realism that gives the user a euphoric listening experience. With the WA33, music comes to life.

* One year factory warranty

* AC Power cord and audio cables are not included.

* International orders will be invoiced + 3% transaction fee.

Tube Complement:
Four 2A3 power tubes in matched quad
Four 6C45 driver tubes in matched quad
One 5U4G rectifier tubes
Two XLR inputs, one RCA input
One XLR preamp output
Headphone outputs: one 1/4" (6.3mm) TRS, one 4-pin XLR, one dual 3-pin XLR
Headphones impedance : 8—600 Ohms
Frequency response: 10Hz— 60kHz, -2dB
Preamp maximum output: 10V + 10V balanced
Preamp output impedance: 50 ohms
Power output: up to 10 watts per channel
Signal/Noise: > 95 dB
THD: < 0.05%, 1kHz
External dimensions: 17.5"(W), 12"(D), 7.5"(H), add 5 to 6" with tube installed
Voltage: AC 120/240V, 50/60 Hz
Power consumption: 150 watts
Weight: 50 lbs

Fully Balanced Direct-Heated Triode, Class A, Output-transformer design
Point-to-Point wiring
The Internal Coupling Architecture (ICA) merges amplifier and power supply without an external umbilical cord to form a single unit.
Amplifier unit mounted permanently on the power supply
User selectable outputs: preamp or headphone
User selectable High or Low IMPEDANCE
User selectable High or Low LEVEL headphone output
User selectable inputs: XLR or RCA