The Warm Audio JUDE-MP is a single-channel microphone preamp based on the original Sound Techniques A-Range console circuit. Developed through an official collaboration with Sound Techniques, it brings the distinctive preamp design associated with historic Trident Studios recording equipment into a modern studio format. The circuit was designed by Geoff Frost, the engineer behind the original console design. Its Class-A architecture is intended to preserve the depth, punch, and musical character associated with the original equipment.

Authentic Signal Path

Jude preserves key elements of the original A-Range preamp design rather than simply recreating its general sonic character. The signal path includes a dual-discrete 3035 Class-A amplifier and the original-style impedance-matching control developed around Geoff Frost’s design. This approach allows the preamp to respond dynamically to different microphones and source signals. The resulting architecture provides a broad range of tonal interaction for engineers working with both vintage and modern microphones.

Z-Match Impedance Control

The 9-position Z-Match control provides variable microphone input impedance and changes the interaction between the microphone and preamp. By selecting different impedance settings, engineers can alter the response and tonal character of connected microphones. The available settings include 60, 200, and 1.5K input impedance ranges through the Z-Match circuit. This makes the Jude particularly useful when experimenting with different microphones, recording techniques, and desired tonal responses.

Custom Transformer Design

Jude uses custom-wound CineMag transformers selected specifically for the preamp design. Its input stage incorporates a 3-impedance CineMag transformer, while the output stage uses a high-purity nickel CineMag transformer. These transformer stages work with the discrete Class-A circuitry to shape the overall response and character of the preamp. Premium Wima and Nichicon audio-grade capacitors are also incorporated into the circuit for a carefully selected component configuration.

Hand-Wired Construction

The Jude is manufactured using a hand-wired construction approach based on specifications supplied by Sound Techniques. Its component selection, PCB layout, transformers, and signal path are designed around the original console architecture. The aluminum faceplate and steel chassis provide a durable enclosure suitable for professional studio environments. A VU meter provides visual level indication, giving engineers a convenient way to monitor signal levels during recording.

Studio Recording Applications

The Jude is designed for engineers and producers seeking the character of a classic British console preamp in a dedicated single-channel unit. Its combination of variable impedance, transformer coupling, Class-A circuitry, and flexible input and output connections makes it suitable for a wide range of recording sources. It can be used with vocals, guitars, piano, drums, and other microphones requiring additional tonal shaping. The 48V phantom power, polarity switch, and line-level switch further support common studio recording workflows.

Product Specifications:

Product Type: Single-Channel Console Microphone Preamp

Circuit Design: Sound Techniques A-Range Console Preamp

Amplifier Design: Dual-Discrete 3035 Class-A

Preamp Gain: 65 to 76 dB at 40 Source Impedance

Input Impedance: 60, 200, 1.5K

Impedance Control: 9-Position Z-Match

Input Transformer: Custom-Wound 3-Impedance CineMag

Output Transformer: Custom-Wound High-Purity Nickel CineMag

Capacitors: Nichicon Audio Grade and Wima

Equivalent Input Noise: -128 dBu, A-Weighted

Self-Noise: -99 dBu, A-Weighted

THD: 0.008%

Frequency Response: 10 Hz to 25 kHz, 2 dB

Phantom Power: 48V

Polarity Switch: Yes

Line-Level Switch: Yes

Microphone Input: XLR

Instrument Input: 1/4 in. TS/TRS

Line Output: XLR and 1/4 in. TRS

Level Indication: VU Meter

Faceplate Material: Aluminum

Chassis Material: Steel

Construction: Hand-Wired

Application: Studio Recording, Vocals, Guitars, Piano, Drums

Product Weight: 6.5 lbs.

Product Dimensions (L x W x H): 13.6 x 5.6 x 5.2 in.