Woo Audio

WA22 (2nd gen) Fully-balanced Headphone Amplifier / Preamplifier

Introduced 2009$2,699 MSRP

The WA22 is Woo Audio's long-running fully balanced, all-tube, transformer-coupled headphone amplifier and preamplifier, originally launched in 2009 and refreshed to a 2nd generation in 2018. It uses point-to-point wiring with a 6SN7 driver / 6080 power / 5U4G rectifier tube complement in a Class-A, push-pull topology, and can be user-upgraded with higher-current 7236 power tubes and premium rectifiers for greater output into demanding headphone loads.

MSRP

$2,699

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Specifications

THD: ≤0.3%
Price: From $2,699 (2nd gen, current)
Inputs: 1× XLR balanced, 1× RCA single-ended, with SE/balanced selector switch
Weight: 26 lbs (2nd gen); 25 lbs (1st gen)
Dimensions: 8.5" (H) × 12" (D) × 12.5" (W) with tubes (2nd gen); 7 × 12 × 10.5 in. (H×W×D) (1st gen)
Power output: ~1.5 W/ch @ 32Ω (2nd gen spec); 810 mW with stock 6080 tubes, up to 2 W with 7236 power tube upgrade (1st gen)
Tube complement: 2× 6SN7 driver, 2× 6080 power, 1× 5U4G rectifier (stock); optional 7236 power tubes and Sophia Princess Mesh Plate 274B rectifier upgrade
Headphone outputs: Dual 3-pin XLR (L/R), 4-pin XLR, 1/4" (6.3mm) stereo jack, plus XLR balanced preamp output
Frequency response: 8Hz–50kHz, −3dB
Signal to noise ratio: 92 dB
Recommended headphone impedance: 8–600Ω