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Stax SRM-700T

Vacuum Tube Driver Unit (Amplifier) for Electrostatic STAX Headphones
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High-End Vacuum Tube Driver with High Output GT Tube “6SN7”
“6SN7” GT tube has been adopted in the second stage of the vacuum tube system, while custom-made low-noise dual FET is employed in the first stage. The vacuum tube 6SN7 that has become the original form of 6FQ7 realizes simple and powerful performance. The hybrid type driver has adopted the high-quality non-inductive winding resistor from VISHAY Co. as a load resistance. The clear and high slew-rate vacuum tube sound has been improved further to polish up warm and spacious reproduction.

  • GT tube “6SN7” that realizes highly transparent sound.
  • Non-inductive winding resistor with least inductance made by VISHAY Co.
  • Strictly selected pair-matched special FET.
  • High-definition film capacitor made by German WIMA is used.
  • Level control switch that can bypass the volume of the unit.
  • As with SRM-T8000, a shield case is used for the volume device.
  • RCA and XLR inputs are switchable. RCA input supports parallel out.
  • The newly developed large-sized aluminum insulator combined with new vibration-proof material and high frictional coefficient (grip power) has been employed. The friction power is so high that you almost need not hold the unit when inserting the plug of your earspeaker.


Daniel Dimitrov

We have a comprehensive selection of Stax devices available for demonstration in our HiFi and headphone studios in Berlin-Kreuzberg. We look forward to your visit!

Type: FET input + vacuum tube output hybrid DC amplification driver unit
Vacuum tube: 2x 6SN7
Frequency response: DC – 100kHz (with one SR-009S)
Gain: 60 dB
Harmonic distortion: 0.01% or less (1kHz/100Vrms output)
Input impedance: 50kΩ (RCA), 50kΩ x 2 (XLR)
Maximum output voltage: 340Vrms (1kHz)
Bias voltage: PRO Bias 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
Leistungsaufnahme: 54W
Dimensions (WxHxD): 240x103x393 mm (maximum protruding portion included)
Weight: 5.7kg
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