STAX SRM-500T

Stax introduces a new SRM-500T model to replace its SRM-006tS successor. The SRM-500T uses a pair of 6FQ7 / 6CG7 vacuum tubes for output, driven by a custom low-noise dual FET. Stax takes pride in offering a high-value electrostatic speaker with the best possible performance.

The newly designed power transformer enables energy efficiency. As a result, it achieves improved sound quality compared to the conventional vacuum tube output drive unit found in the SRM-006tS.

Technical Specifications

Electrical Specifications

• Type: Hybrid amplifier with TEC (FET) input and tube output
• Tube: 6FQ7, 6CG7
• Frequency response: DC - 90 kHz (with SR-L500 MK2)
• Gain: 60 dB
• Harmonic distortion: ≤ 0.01% (at 1 kHz / 100 V RMS output)
• Maximum output voltage: 300 V RMS (1 kHz)
• Bias voltage: 580 V DC

Impedance and Connectivity

• Input impedance:
  • RCA: 50 kΩ
  • XLR: 2 × 50 kΩ
• Inputs:
  • 1 × RCA
  • 1 × XLR (exclusive selection)
• Outputs: Parallel RCA

Physical Characteristics

• Dimensions (W × H × D): 195 × 102 × 376 mm (including protruding parts)
• Weight: 3.4 kg
• Power consumption: 38 W
• Operating conditions:
  • Temperature: 0 to 35 °C
  • Humidity: < 90% (non-condensing)