Microphone Preamplifier

500 Series Microphone Preamp

The Twin-Servo™ is a high performance microphone preamp that leverages two discrete 990 op-amps for incredibly clean and transparent operation.

  • Exceptionally wide frequency response from 0.5Hz to 150kHz
  • Twin-Servo topology eliminates capacitors in the signal path
  • Virtually zero phase shift or bandwidth limitation
  • Oversized Jensen® transformers for maximum headroom

Legendary Performance

The Twin-Servo utilizes the now-famous JE-990 circuit originally developed by industry icon Deane Jensen in 1988, providing an update in the 500 series format. Its superior performance is derived from two 100% discrete 990 op-amps cascaded in tandem to deliver 60dB of gain with less than 1/10th the distortion and twice the bandwidth of a single stage design. This also reduces noise at mid and low levels, a critical advantage for those that record with a wide dynamic range. In order to minimize phase distortion, all capacitors have been removed from the audio signal path and replaced by two DC servo feedback circuits. Oversized Jensen™ transformers are placed at both the input and output of the — producing a frequency response that extends from 0.5Hz to 150kHz. The result is a remarkably detailed and accurate microphone preamp suitable for any critical recording application.

Twin-Servo Applications

Using the Twin-Servo with a condenser mic

The Jensen Twin-Servo has almost unlimited bandwidth and tremendous headroom. This makes it a perfect choice for the most demanding recording, particularly when recording highly dynamic signals such as vocals or orchestral instruments.

Using the Twin-Servo with an active DI

When recording live, capturing the direct feed from an instrument can provide much more consistent results as bleed from other instruments can be eliminated. Connect a piezo transducer to the Radial PZ-DI and send this to the Twin-Servo for amazing bottom end!

Using the Twin-Servo with a ribbon mic

Most modern ribbon microphones have plenty of output and can connect directly to the Twin-Servo’s low noise circuitry. When using old vintage mics, add the Radial McBoost to increase the output by up to 25dB for a total of about 85dB of gain!



Twin-Servo Resources

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