Woo Audio WA2 (OTL Design) Headphone Amplifier

Overview

Handcrafted since 2004, the critically acclaimed WA2 is a high performance OTL (Output Transformerless) headphone amplifier. WA2 is a Class-A, all-tube design, single-ended triode (SET) with point-to-point wiring to achieve the most analog sound. Music lovers with high impedance headphones (above 100 Ohms) would find WA2 to be the ideal pairing for their high-end headphones.

Highlights

• Tubes: 6080 power x 2, 6922 driver x 2, 6CA4 rectifier x 2

• Polytetrafluoroethylene (PTFE) tube sockets

• Single-ended Triode, Class-A

• OTL (output transformerless), Point-to-Point wiring

• Individual filter choke and rectifier per channel

• Pseudo-dual power supply

• RCA input x 4

• 1/4" (6.3mm) stereo headphone output

• ALPS potentiometer and power switch

• Anodized aluminum chassis, available in black or silver

• Self-biasing with compatible tubes [chart]

• Global voltage (100v–220v) without converter

• Dimensions: 5½"(H), 13"(W), 9"(D), 17 lbs.

In the box

• Quick start guide

• WA2 headphone amplifier x 1

• 6922 vacuum tube x 2

• 6080 vacuum tube x 2

• 6CA4 vacuum tube x 2

*AC power cord and audio cables are not included

Specifications

Colors: Black, Silver

Headphone Impedance: 26-600 Ω

Input Impedance: 100 kΩ

Frequency Response: 8 Hz - 100 kHz -3 dB

Power Output:
310mW @32Ω
400mW @60Ω
550mW @120Ω
640mW @300Ω
480mW @600Ω (with 6080 tube)

Signal/Noise: 95 dB

THD: <= 0.08%

Voltage: AC 110/220 - 240V, 50/60 Hz, switchable