Stax SRM-700T

• OTL tube output stage with
  
• 6SN7 dual triodes
  
• Warm, powerful sound
  
• For up to two Stax headphones
  

Proven technology improved

STAX has never chased fleeting trends, and with the replacement of the successful STAX SRM-007t II and SRM-727 II driver amplifiers, which have been on the market since 2006, STAX remains true to itself and this motto. The two new driver amplifiers, the SRM-700T and SRM-700S, benefit from technologies used in the flagship SRM-T8000: In the new tube driver amplifier SRM-700T, which operates without an output transformer (OTL), STAX employs two 6SN7 dual triodes and non-inductive winding resistors from Vishay Co., as well as specially manufactured low-noise dual-FETs in the first amplifier stage, which are also used in the transistor sibling, the STAX SRM-700S. In the latter, STAX has, for the first time ever in a STAX driver amplifier, implemented J-FETs in the second amplifier stage. J-FETs are particularly suitable for low-noise amplification of even the most power-hungry transducers.

This catapults the performance of both STAX models far beyond their price range.

STAX has also modernized the amplifiers visually, giving them an extremely elegant new look.


The STAX SRM-700T, the sonic alternative to the STAX SRM-700S at the same quality level. Compared, it offers a more colorful and resolving sound, with powerful bass. Symmetrically structured circuit design. Volume/balance control via a quadruple potentiometer encapsulated for electrical shielding.

Simultaneous operation of two STAX headphones is possible with the STAX SRM-700T.

The STAX driver amplifiers for electrostatic headphones can be operated from the recording output (Tape/Record Out) of preamplifiers and integrated amplifiers, or from the preamplifier output (Pre Out) of a preamplifier. The source device to be played is then selected via the input selection of the preamplifier or integrated amplifier. The integrated volume control can be deactivated if the volume is to be controlled via the preamplifier or integrated amplifier.

However, a CD player or a turntable with a separate phono preamplifier can also serve directly as a signal source. The music signal present at the input of the driver amplifier can be looped through for connecting another device. If a source device is to be connected digitally, a separate D/A converter is necessary. The connection can be either unbalanced or balanced.


Note on the operating voltage (polarization voltage) of STAX headphones
Many early STAX headphones are designed for an operating voltage of 230V/DC. PRO series headphones - which include all current models - require a higher operating voltage of 580V/DC.
In the past, driver amplifiers were offered that provided both operating voltages. Current devices only have connections for the higher operating voltage of 580V/DC.
To avoid confusion, the connection sockets for the different operating voltages have different pin configurations.