REALIOS® 9031 Microphone Preamplifier

The Classic Dick Swettenham Olympic Studios Design

  • All discrete transistor design
  • Input and output transformers
  • 20 to 70 dB of gain in 5 dB steps
  • Great sounding high-impedance DI
  • Single space 500 series module

Dick Swettenham's three transistor microphone preamp design is truly a thing of beauty. The sound of these types of microphone preamps is legendary. You've heard it on records made at Olympic studios in the 60s and 70s. It's now available again in a 500 series module.

This version features a class-A transistor output stage which will drive the most demanding of loads. This feature is most welcome since the original Olympic microphone preamps were integral parts of their respective mixing desks and never meant to be connected directly to an output.

Other additions include: finer gain steps (5 dB), a high-impedance FET DI, phase reverse switch, and switchable phantom power.

REALIOS 9031 Features

  • Meticulously developed, super high quality mic input transformer
  • Extremely open, high-impedance DI
  • 20 dB pad
  • Switchable phantom power
  • Separate variable high and low shelves
  • Phase reverse switch
  • Hard bypass

REALIOS 9031 Specifications

  • Microphone Input Impedance: 1.2 kΩ, balanced
  • DI Input Input Impedance: greater than 3.3 MΩ, balanced
  • Output Impedance: less than 50 Ω
  • Max. Output Level: +32 dBu, transformer balanced
  • Gain: 20 to 70 dB in 5 dB steps
  • Frequency Response: +/- 1 dB from 0.15 Hz to 25 kHz
  • Noise Level: better than 74 dB below +4 dBu, 0-30 kHz