REALIOS® 9033 Microphone Preamplifier

A New Idea In Microphone Preamps

  • All discrete transistor design
  • All voltage gain from transformers
  • Extremely open and uncolored
  • Headroom for days—it will not clip
  • Switchable phantom power
  • Single space 500 series module

A clipping problem arose one day while recording a really loud vocalist singing through a U47 microphone. The problem was assumed to be the clipping of the microphone since every mic preamp in the studio also was clipping in this signal chain.

Upon further measurement it was determined that the U47 output was not clipping, it was outputing a signal of -15 dBm. Too much output for most mic preamps.

The solution is the REALIOS 9033. This microphone preamp was designed for this situation. However, the added benefit of passive voltage gain possibly makes this the most transparent and open sounding microphone preamp ever.

REALIOS 9033 Features

  • Passive transformer gain
  • Switchable phantom power
  • Phase reverse switch

REALIOS 9033 Specifications

  • Microphone Input Impedance: 1.2 kΩ, balanced
  • Output Impedance: less than 50 Ω
  • Max. Output Level: +32 dBu, transformer balanced
  • Gain: 5 to 20 dB in 3 dB steps
  • Frequency Response: +/- 1 dB from 7Hz to 85 kHz
  • Noise Level: better than 86 dB below +4 dBu, 0-30 kHz