STAX SRM-500T Vacuum Tube Driver Unit High-Fidelity Earspeaker Amplifier

The STAX SRM-500T is a premium vacuum tube driver unit designed exclusively for STAX electrostatic earspeakers (often called “earspeakers” rather than headphones due to their unique design and sound signature). Engineered for discerning audiophiles, the SRM-500T blends cutting-edge hybrid technology with timeless analog warmth to deliver an exceptional listening experience.

At its core, the SRM-500T utilizes a hybrid amplification system combining a FET (Field-Effect Transistor) input stage with a vacuum tube output stage—featuring the revered 6FQ7/6CG7 tube. This hybrid design captures the transparency and speed of solid-state circuits, while imbuing the output with the rich, natural tonality that only vacuum tubes can provide.

The unit boasts a wide frequency response from DC to 90kHz, ensuring every nuance and harmonic detail in the music is preserved. With a gain of 60dB, maximum output of 300Vrms, and bias voltage of 580V DC, the SRM-500T is capable of driving even the most demanding electrostatic earspeakers with authority and finesse.

A hallmark of its build is low harmonic distortion (0.01% or less), reflecting the precision of its internal architecture. The SRM-500T also offers both RCA and XLR inputs, with a mutual exclusion input system, along with RCA parallel output for flexible connectivity in high-end setups.

Finished in a sleek, compact chassis, this amplifier is designed not only for performance but also for seamless integration into any high-end audio environment.

Features

• FET Input + vacuum tube output hybrid DC amplification
• Newly Designed Vacuum Tube Output Stage
• Custom-Made Low Noise Dual FETs
• Pair of 6FQ7/6CG7 pre-installed Vacuum Tubes
• Pair of RCA input terminals
• Pair of XLR 3-pin input terminals
• RCA parallel output terminals

Specifications