CONTROLS & CONNECTIONS

2 . 2 P R E A M P L I F I E R

GAIN: Provides +52dB of gain for the microphone input and +44dB of gain for the instrument input.

IMPEDANCE SELECTOR: Selects the amount of resistance that is applied to the microphone input. This selector allows you to match (or intentionally mismatch) the input impedance of the Eureka with the impedance of your microphone. As the Eureka’s impedance is lowered, different filtering effects can result delivering a tailored sound for a particular application.

SATURATION CONTROL: Selects the amount of increase (0% to 100%) applied to the even harmonic series of the signal being amplified by the EUREKA. The effect of manipulating the harmonic distortion is of increasing or decreasing the apparent “warmth” of the signal. This feature is derived from manipulating the drain current of the FET input buffer of the Mic Preamp. Experiment with the SATURATION control and see what type of sounds you can get from your present microphone selection.

LINE: Selects the line input on the back as the input in use. When using the Line input, the microphone preamplifier stage is bypassed and thus the GAIN, IMPEDANCE and SATURATE controls are inactive.

+48V: The 48 volts supplied by way of the XLR connector, provides power for condenser mics and any other devices requiring continuous phantom power through the XLR input. This power is supplied at a constant level to prevent any degradation of audio quality.

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Eureka Microphone Preamplifier user manual R E a M P L I F I E R
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Microphone Preamplifier specifications

The Eureka Microphone Preamplifier is a versatile and high-performance tool designed for audio professionals seeking clarity and detail in their recordings. Known for its exceptional sound quality and innovative features, the Eureka has become a popular choice for both studio and live sound applications.

One of the standout features of the Eureka is its Class A vacuum tube circuitry, which provides a warm and rich tonal character to the audio signal. This analog warmth is complemented by the preamp's exceptional bandwidth, allowing for a natural representation of the sound source. The use of high-quality components contributes to its low noise floor, ensuring that even the most delicate sounds are captured with precision.

The Eureka preamp is equipped with an impressive gain range, enabling users to amplify their microphones effectively without compromising sound quality. Its gain is adjustable up to 64 dB, which makes it suitable for a wide variety of microphones, including low-output dynamic mics and high-sensitivity condenser mics. This flexibility ensures that it can adapt to any recording scenario, whether it's capturing vocals, instruments, or ambient sounds.

Another noteworthy characteristic of the Eureka is its built-in high-pass filter, which eliminates unwanted low-frequency rumble and wind noise. This feature is particularly advantageous for field recording and live situations, allowing users to achieve a cleaner and more focused sound. Additionally, the preamp features a phase reverse switch, which is essential for combating phase issues when using multiple microphones.

The Eureka's user-friendly design includes LED metering for input level monitoring, providing real-time feedback on the signal's strength. This visual aid helps engineers make informed decisions about gain settings, ensuring optimal headroom and preventing clipping.

For connectivity, the Eureka offers both XLR and 1/4-inch outputs, making it compatible with a wide range of audio interfaces and mixing consoles. The robust build quality ensures that it withstands the rigors of both studio and live environments, making it a reliable choice for audio professionals.

In summary, the Eureka Microphone Preamplifier combines advanced technology with practical features, delivering outstanding sound quality and versatility. Its Class A vacuum tube circuitry, adjustable gain, high-pass filter, and solid build make it an essential tool for anyone serious about their audio recordings.
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