More on Amazon.com : http://www.amazon.com/gp/product/B00KDPWQCW?tag=purrfectcatdi-20
Woo Audio WA6 Vacuum Tube Class-A Headphones Amplifier (Black)
Single-ended triode Class A Output Transformer Coupled
Headphone impedance 8 - 600 Ohms
1 x 274B rectifier 2 x 6DE7 driverpower tubes
Point-to-point wiring Custom made output transformer
Selectable Voltage AC 110220 V 5060 Hz
