Stax SRM-700T Earspeaker Driver Unit


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High end vacuum tube driver unit

The newly designed SRM-700T is a hybrid electrostatic headphone driver. Inspired by the flagship model SRM-T8000, the 700T uses solid-state FET as a driver stage and vacuum tube as the output stage.

Hybrid Masterpiece

Experience the best of both worlds with the unique hybrid design. The SRM-700T seamlessly blends a custom-made low-noise dual FET input stage with a warm, musical 6SN7 vacuum tube output stage. This synergy delivers exceptional clarity, detail, and a captivatingly spacious soundstage.

Inspired by Greatness

Drawing from the heritage of the flagship SRM-T8000, the SRM-700T incorporates high-quality non-inductive winding resistors and strictly selected pair-matched special FETs. These meticulous engineering choices ensure uncompromised audio performance and unwavering reliability.

Unleashing the Potential

Drive even the most demanding Stax earspeakers with ease. The SRM-700T boasts a powerful high-voltage power supply, delivering impeccable control and dynamic range for a truly immersive listening experience.

STAX produce exclusively electrostatic headphones, or “earspeakers” since 1938. STAX chose the electrostatic technology for its ability to produce transparent sound, and low weight for comfort/ergonomics, both due to the driver design not employing fixed magnets and moving coils, as opposed to other common headphone driver designs. The minimal weight of the driver ensures a very quick response to the signal, creating a more faithful sound reproduction.


  • Type: FET input + vacuum tube output hybrid DC amplification driver unit
  • Vacuum tube: 6SN7
  • Frequency response: DC – 100kHz (with one SR-009S)
  • Gain: 60dB
  • Harmonic distortion: 0.01% or less (1kHz/100Vrms output)
  • Input impedance: 50kΩ (RCA), 50kΩx 2 (XLR)
  • Maximum output voltage: 340Vrms (1kHz)
  • Bias voltage: PRO 580V
  • Operating temperature / humidity: 0 to 35 degrees C / less than 90% (non condensing)
  • Input terminal: RCA x 1, XLR x 1
  • Output: RCA parallel output terminal
  • Power consumption: 54W
  • Dimension: 240 W x 103 H x 393 D mm (maximum protruding portion included)
  • Weight: 5.7kg

Due to the bespoke nature of our high-end music systems this product is not available to be purchased online. Please contact us for personalized service from one of our team of experts.