Twin-Servo Specifications

The Jensen Twin-Servo 500 is a faithful recreation of Deane Jensen’s famous 990 microphone preamp in a 500 series format. This unparalleled circuit design includes two cascaded 990 op-amps to share the load and provide 60dB of clean gain, as well as two servos that eliminate signal degrading capacitors from the audio path that allow for less than -120dBu of noise. Oversized Jensen input and output transformers produce an exceptionally wide frequency response and plenty of headroom. Twin-Servo is well-suited for recording highly dynamic sources, with 91dB of dynamic handling. Even more important than the specifications is the sound of the Twin-Servo; exceptionally natural and transparent, with detailed highs and an extended low end that will have you hearing your mics like never before.

Audio circuit type: Two stage variable gain all discrete using original Deane Jensen circuit with IC DC servo.
Transformer: Jensen JT-11-EM, JT-16-PCJR
Frequency response: 14Hz to 85kHz / 8Hz to 100kHz (±1dB / ±3dB)
Dynamic range: 91dB
Gain: +60dB
Total harmonic distortion: 0.004%
Intermodulation Distortion: 0.004%
Input Impedance: 1.3kΩ
Output Impedance: 75Ω
Common Mode Rejection Ratio: -72dB
Input pad, 180° polarity reverse, HPF, Phantom Power, OmniPort
Input Connectors: XLR
Extras: OmniPort assigned as unbalanced instrument input
Construction: 500 Series module
Size (L x W x D): 5.25" x 1.5" x 7" (134mm x 38mm x 178mm)
Weight: 1.75lb (0.79 kg)
Shipping size (L x W x D): 6.75" x 1.875" x 9" ( 171mm x 48mm x 229mm)
Shipping weight: 2.20lb (0.997 kg)
Power: 110mA
Conditions: For use in dry locations only between 5°C and 40°C
Warranty: Radial 3-year, transferable

Twin-Servo Resources

Part no: R700 0111 10