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Authentic Tube Warmth
Experience rich harmonic tones that digital plugins can't replicate, providing a classic sound that enhances your recordings and performances with natural warmth and depth.
KEY FEATURES
The Mystery Magicians RBDI is a fully‑tube, Class A 1U rack‑mount direct box and instrument pre‑amp that delivers up to 53 dB of gain, three‑band tube EQ, hi‑Z and re‑amp inputs, and a built‑in auto line‑detecting power supply for worldwide plug‑and‑play operation.
Overview
The RBDI marries classic tube warmth with modern studio flexibility. Its all‑tube signal path runs 12AU7 NOS tubes at 320 V, providing natural harmonic richness, fast transients and ample headroom. Hand‑wound output transformers, Japanese TOCOS sealed pots and CNC‑machined anodised aluminium knobs ensure durability and precision.
Input Section
A hi‑Z front‑panel jack accepts passive or active pickups, while a dedicated re‑amp XLR input handles line‑level sources. The REAMP/NORMAL switch lets users toggle instantly between the two inputs, facilitating seamless source changes during tracking or post‑production.
Gain Structure
The switchable HIGH/LOW gain front end taps either the full first dual‑triode stage (high gain) or the second half (low gain), giving users fine control over sensitivity. Input and output gain knobs let musicians drive the tube stages from pristine clean tones to rich, controlled saturation.
Tone‑Shaping Section
A true‑bypass three‑band tube EQ offers ±15 dB bass, ±6 dB mids and ±10 dB treble adjustment. The Bright switch acts as a dynamic high‑frequency boost that tapers off as gain increases, preserving clarity without harshness. Combined with the EQ, the Bright circuit enables classic “Pultec‑style” boost‑and‑cut tricks for nuanced tonal sculpting.
Additional Controls
Phase reversal and ground‑lift switches eliminate polarity issues and hum loops. A –20 dB balanced output pad protects downstream gear when the tube stages push hard. Front‑panel thru connections allow parallel routing to tuners, amplifiers or external processors.
Construction & Reliability
The chassis features dual‑tone hammertone powder‑coated steel, Omron audio‑grade relays for signal switching, and WIMA, Panasonic and TRW audio‑grade capacitors for low‑noise performance.
Why Choose Mystery Magicians RBDI
- All‑tube character – authentic harmonic richness that digital plugins struggle to emulate.
- Versatile I/O – hi‑Z, re‑amp and balanced outputs cover guitars, basses, synths, microphones and more.
- Robust build – hand‑wound transformers, premium components and CNC‑machined housing guarantee longevity.
- Dynamic EQ – three‑band tube EQ plus a smart Bright circuit delivers studio‑grade tone shaping.
- Global readiness – auto line‑detecting power supply removes the need for external adapters.
- Fully tube‑based, Class A 1U rack‑mount direct box and pre‑amp
- 12AU7 NOS tubes operating at 320 V for full Class A performance
- Up to 53 dB of clean gain, suitable for high‑impedance microphones
- Switchable HIGH/LOW gain front end for precise sensitivity control
- Input gain and output gain knobs for full tonal range
- True‑bypass three‑band tube EQ (±15 dB bass, ±6 dB mids, ±10 dB treble)
- Bright switch that dynamically boosts highs at low gain and tapers at high gain
- Dedicated line‑level re‑amp XLR input with REAMP/NORMAL selector
- Hi‑Z front‑panel input handling passive and active pickups
- Phase reversal switch and ground‑lift switch for polarity and hum management
- –20 dB balanced output pad for safe interfacing with downstream gear
- Front‑panel thru connection for parallel routing to tuners or amps
- Hand‑wound output transformers built in‑house
- Japanese TOCOS sealed potentiometers, Omron relays, metal‑film resistors
- WIMA, Panasonic and TRW audio‑grade capacitors for low noise
- Dual‑tone hammertone powder‑coated steel chassis, CNC‑machined aluminium knobs
- UK over £99 FREE
- UK under £99 £10
- EU £36
- Rest of World £80
Large/Heavy items: Extra charges may apply (e.g., consoles, large monitors). We’ll contact you before processing if so.
We ship with DPD and UPS across the UK, EU and worldwide. Same-day within the M25 is available depending on stock.
This item, like everything we supply, comes with the complete support of our expert team. Our excellent technicians have been specifying, building and supporting studios for over twenty years. If you have any problems with installation, setup or everyday use, they’re never more than a click away, and always happy to help.
You can contact them here.
KEY BENEFITS
Versatile Input Options
Seamlessly switch between hi-Z and re-amp inputs, accommodating a wide range of instruments and sources for ultimate flexibility during tracking and post-production.
Durable and Reliable Construction
Built with premium components and robust design, ensuring longevity and consistent performance, making it a dependable choice for both studio and live environments.