Woo Audio

3ES (2nd gen) Electrostatic Headphone Amplifier

The Woo Audio 3ES (2nd gen) is a two-tier electrostatic headphone amplifier for 5-pin 580V Pro-bias headphones from STAX, Audeze, HiFiMan, and MrSpeakers. Its redesigned output stage uses a matched quad of 300B power tubes with house-made push-pull output transformers, while the driver stage offers selectable TUBE operation with two 6SN7 tubes or HYBRID operation using precision transistor amplifiers. It includes dual headphone outputs, two XLR inputs, one RCA input, a 5U4G rectifier, and a maximum output of 1500 Vrms.