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