Stax T700T Tube Energizer
Stax T700T Tube Energizer
Stax T700T Tube Energizer
Stax T700T Tube Energizer

SRM-T700T Valve Energizer

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.

2 Years




The first stage is a custom-made low-noise dual FET while the “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.

The T700T features switchable RCA and XLR inputs. RCA parallel out and bypass volume control switching.

The newly developed large-sized aluminium insulator combined with new vibration-proof material and high frictional coefficient (grip power) have been employed.

Like the successful T8000 energizer, the T700 features a new updated look which brings Stax into the modern world in terms of styling.

Please note that this device can only drive STAX’s electrostatic earspeakers

FET input + vacuum tube output hybrid DC amplification driver unit

Vacuum tube
6SN7 x2

Frequency response
DC – 100kHz (with one SR-009S)


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

RCA parallel output terminal

Power consumption

240 W x 103 H x 393 D mm (maximum protruding portion included)