Woo Audio

WA6-SE (2nd gen) Headphone Amplifier

Introduced 2017$1,649 MSRP

The Woo Audio WA6-SE is an all-tube, single-ended triode Class-A headphone amplifier hand-built with point-to-point wiring in New York. Now in its 2nd generation, it uses a transformer-coupled output stage with dual 6.3mm HI/LO impedance headphone jacks to drive headphones from 8–600 ohms.

MSRP

$1,649

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Specifications

THD: Under 0.05% from ~5mV–200mV for 600Ω headphones; not more than 0.3% overall
Inputs: 2× RCA line-level inputs, 100 kΩ
Weight: Amplifier 12 lb; power supply 10 lb (22 lb combined)
Outputs: Dual 6.3mm (¼") stereo headphone jacks with HI/LO impedance selection, taken from separate output-transformer taps
Topology: All-tube, Class-A, transformer-coupled, single-ended triode (SET), point-to-point wired
Dimensions: Amplifier chassis and outboard power supply each 6" H × 5.5" W × 13" D
Power output: 2W @ 32Ω; 1.9W @ 60Ω; 1.8W @ 120Ω; 1.3W @ 300Ω; 0.8W @ 600Ω (measured, per Ken Rockwell review of prior-gen unit with 6DE7/6CY7 tubes)
Tube complement: 2× 13DE7 driver/power tubes; 1× 5U4G rectifier tube
Frequency response: 15 Hz–40,000 Hz at −3 dB
Headphone compatibility: 8–600 Ω dynamic and planar-magnetic headphones