Warm Audio JUDE-MP Microphone Preamp

JUDE-MP Microphone Preamp — Authentic Sound Techniques A-Range Circuit

The JUDE-MP is a single-channel, dual-discrete console microphone preamp and a one-for-one recreation of the original Sound Techniques "A-Range" console circuit designed by Geoff Frost. Built in partnership between Sound Techniques and Warm Audio, this tabletop unit preserves the hand-wired signal path that defined legendary recordings at De Lane Lea Studios, Trident Studios, and Sunset Sound. Dual-discrete 3035 Class-A amplification and custom CineMag USA transformers deliver the depth heard on classic tracks by The Beatles, David Bowie, Elton John, and Queen.

What Sets This Preamp Apart

The exclusive 9-position Z-Match impedance control optimizes the relationship between microphone and preamp with nine distinct tonal interactions. Unlike a simple tone switch, the input transformers physically change characteristics depending on the Z-Match position, shaping gain, transient response, and harmonic character across ribbon, condenser, and dynamic microphones.

Signal Path & Amplification — Class-A Discrete Design

The signal path mirrors the original Sound Techniques console topology with hand-wired construction.

• Amplifier Topology: Dual-discrete 3035 Class-A — original Sound Techniques circuit for vintage harmonic character
• Input Transformers: Custom CineMag USA, 3-impedance — physically rewire impedance per Z-Match setting
• Hand-wired construction with Wima and Nichicon audio-grade capacitors and carbon resistors

Impedance & Gain Control — Z-Match Tone Shaping

The Z-Match control matches microphone impedance to the preamp for optimal gain staging across any source.

• Mic Input Impedance: 60Ω / 200Ω / 1.5KΩ / 10KΩ — four positions for ribbon, condenser, dynamic, and line-level sources
• Preamp Gain: 65–76 dB (40Ω source impedance) — ample headroom for low-output ribbon and vintage dynamics
• Equivalent Input Noise: -128 dBu (A-weighted)

Performance & Connectivity — Studio-Ready I/O

Every connection and performance figure integrates cleanly into modern studio workflows while preserving vintage circuit behavior.

• Frequency Response: 10 Hz – 25 kHz (±2 dB) — extended bandwidth captures full harmonic content of any source
• THD: 0.008% / Self-Noise: -99 dBu (A-weighted)
• Inputs: XLR Mic, TS/TRS 1/4" Line/DI / Outputs: XLR and 1/4" TRS line-level — flexible routing for tracking, re-amping, and stem processing