WES is an uncompromised design, featuring EL34, 6SL7, and 5AR4/5U4GB rectifier.
All-triode drive, fully balanced. Two units design - AMP unit and Power Supply unit with dual power switch
Innovative stackable chassis with exposed tubes.

NEW: A major revision is in place for further sound quality refinement (2011 rev).
NEW: A standard unit now build with 2 STAX headphone outputs. The HE90 output is optional.

The WooAudio WES and Stax SR-007 Mk2 headphones will dazzle your ears with state of the art sound for a tiny fraction of the cost of a system built around speakers. - Home Entertainment

* Normal build time is 2 to 4 weeks.

* Included tubes:
    1 quad of EL34 (power), 1 quad of 6SL7 (driver),
    2 5AR4 (rectifiers), 2 12AU7 (phase splittor)

* PSU to AMP power supply cord is included.

* AC power supply cord, interconnection cable are not included

* Shopping cart applies to the U.S. buyers only. International buyers please contact for shipping cost and payment instruction

Owner's Manual(PDF)

Technical Specifications:
• Fully balanced topology
• 1300 volts peak-peak voltage swing
• Stax PRO bias 580V
• Sennheiser HE90 bia 500V
• * Dual power switch
• Standard chassis size
• Removalbe glass panel
• External dimension:
         PSU: 4.5”(H), 16.5”(W), 12”(D)
        AMP: 7.5”(H), 16.5”(W), 12”(D) (with tube guard)
• Weight (AMP + PSU): 40 pounds or 18.2 kg

* From a cold start, the dual power switch protects the tubes from a high current surge. Turning on just one of the power switches provides low voltage to the heaters while the unit remains in stand-by mode. Turning on both power switches allows the unit to function properly.

Standard Features:
• Point-to-Point Wiring
• Four EL34 power tubes
• Four 6SL7 [PDF] drive tubes
• Two 5AR4 [PDF] rectifier tube. Direct substitute: 5U4GB
• Two 12AU7 [PDF] phase splittor (back of the AMP unit) - unbalanced input to balanced input conversion
• Two selectable balanced inputs
• One selectable unbalanced input
• One 5-pin pro bias output
• One HE-90 output
• DACT CT4 stepped attenuator
• Auricap capacitors for inter-stage and output coupling
• Mills and Kiwame resistors
• Telfon tube sockets

Parts upgrade 1:
V-Cap inter-stage coupling caps $1280

V-Cap Teflon Film Tin Foil reference grade audio capacitors

• V-Cap TFTF 0.22uF/300V (12 pcs)

Parts upgrade 2:
V-Cap output coupling capacitors $380

V-Cap Oil Impregnated Metallized Polypropylene reference grade audio capacitors

• V-Cap OIMP 2uF/600V (4 pcs)

Power tubes upgrade:
Shugang 50-Years Treasure 6CA7 matched quad.
We source the top quality tubes from the manufacturer directly. The tubes would be tested by us in an actual amplifier to meet the highest quality. $480 with 12-month warranty from Woo Audio.

The Treasure series is a statement work of Shuguang's 50-years' of expertise in vacuum tube design and production, a highest quality build. Its unique black glass is due High Polymer Compound Carbon (HPCC) coating. Compared to traditional carbon spray technology, HPCC coating will allow greater concentration of electrons, enhance and maintain stability of the electron flow, maximize "secondary electron emission surpression" from the glass enclosure, in turn reduce effects of electron swirl which generates internal noises from the vacuum tube itself.

Driver tubes upgrade:
Sophia 6SL7 grade A matched quad. $400

Sohpia's latest 6SL7 sounds faithful and looks aesthetically pleasing. It's silky, extended tremble, open mid-range, deep soundstage.

Rectifier tubes upgrade:
Haltron 5AR4 NOS matched pair, U.K. made. $260

These highy regarded rectifiers offer exceptional depth, full body, warm mid-range, fast attack, and reveal fine details in the music.