Hilbe Mo68 500-Series Microphone Preamp

The Hilbe Mo68 is a 500-series microphone preamp built around the Melcor op-amp, a modern classic originally released in 1967. Tom Hilbe Equipment describes its sound as warmer and more musical than other modern op-amp-style mic preamps. A transformer-balanced output, a front-panel Hi-Z instrument input, and 48V phantom power make it a flexible tracking tool for mics and instruments alike. The op-amp is socketed, so maintenance and servicing are straightforward.

Key Features

• Based on the 1968 Melcor mic pre design
• 500-series format with interchangeable, plug-in module design
• Transformer-balanced output
• Direct instrument 1/4″ Hi-Z input
• 48V phantom power
• -20 dB attenuation pad
• Phase reverse
• Selectable 1.2 kΩ and 300 Ω input impedance
• 6-LED colored VU meter
• Socketed op-amp for easy maintenance and servicing

Specifications

• Format: 500-series module
• Preamp Design: Melcor op-amp
• Output: Transformer-balanced
• Instrument Input: 1/4″ Hi-Z
• Input Impedance: Selectable, 1.2 kΩ / 300 Ω
• Phantom Power: 48V
• Pad: -20 dB
• Metering: 6-LED colored VU meter
• Frequency Response: 20 Hz – 20 kHz (±1 dB)
• Harmonic Distortion: 0.75 THD, 20 Hz – 20 kHz @ +24 dBm
• Noise: -124 dBm equivalent input noise
• Power Requirement: ±15 VDC to ±18 VDC
• Connector Type: 15-pin PC
• Dimensions: 1.5″ x 5.25″