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GES Electrostatic Headphone Amplifier

Woo Audio GES electrostatic amplifier
Woo Audio GES electrostatic amplifier

GES Electrostatic Headphone Amplifier

  • In stock, ships in 1–2 days
  • Add 3% for international orders


GES is an all-tube electrostatic headphone amplifier designed to drive any STAX headphones. GES can accommodate a wide range of vacuum tubes which makes it an excellent choice for those who love to experiment with different tubes sound.


  • Tubes: 6S4 power x 4, 12AX7 driver x 4
  • Polytetrafluoroethylene (PTFE) tube sockets
  • Push-Pull direct drive, Class-A
  • High-performance Solen and WIMA capacitors, Point-to-Point wiring
  • RCA input x 2
  • STAX Pro Bias 5-pin EarSpeakers output
  • ALPS potentiometer and power switch
  • Anodized aluminum chassis, available in black or silver
  • Self-biasing with compatible tubes [chart]
  • Global voltage (100v–240v) without converter
  • Dimensions: 5½"(H), 13"(W), 10½"(D), 22.5 lbs.


 *Specifications and appearance are subject to change for improvement without notice.

*Specifications and appearance are subject to change for improvement without notice.


  • Quick start guide
  • GES electrostatic headphone amplifier x 1
  • 12AX7 vacuum tubes x 4
  • 6S4 vacuum tubes x 4

*AC power cord and audio cables are not included

In the box


Driver Tube Upgrade


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