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Woo Audio WA22 Fully Balanced Tube Headphone Amp
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WA22 Fully Balanced Headphone Amplifier Balanced design from input to output, Class-A, All Tube Drive, Output Transformer Coupled Reg. RETAIL: $1,995.



Technical Specifications:
Headphones impedance : 8-600 Ohms
Input impedance: 100 Kilo-Ohms
Frequency response: 8 Hz - 50 KHz, -3dB
Output: 1500mw @32 ohms, 700mw @600 ohms
Signal/Noise: 92 dB
THD: <= 0.3%
External dimension: 7”(H), 12”(W), 10.5”(D)
Weight: 25 pounds or 11.4 kg
Voltage: AC 110/220V, 50/60 Hz

Standard Features:
Point-to-Point wiring
True balanced topology
All tubes. No semi-conductors in the entire circuitry
One 5AR4 [PDF] rectifier tube. Direct substitute: 5U4G
Two 6SN7 [PDF] drive tubes
Two 6AS7 / 6080 [PDF] power tubes
DACT CT2 balanced stereo stepped attenuator
One balanced XLR input
One single-ended RCA input
Two 3-pin balanced headphone output (left and right ch)
One 4-pin balanced headphone output
One single-ended headphone output
High and low impedance switch