The Mystery Magicians RBDI Rackmount Tube Direct Box is a fully tube-based, Class A direct box and instrument preamp designed for professional studio and stage environments where tone, headroom, and flexibility matter most.
Built around a true high-voltage tube design running 12AU7 tubes at 320V, the RBDI delivers authentic harmonic richness, fast transient response, and musical saturation that simply can’t be replicated by starved-plate or solid-state designs. Whether tracking guitars, bass, synths, keys, or reamping previously recorded material, the RBDI brings depth, dimension, and unmistakable tube character to every signal it touches. Housed in a slim 1U rackmount chassis, the RBDI integrates seamlessly into professional studio racks while offering hands-on control over gain staging, tone shaping, and signal routing. A switchable High/Low gain front end lets you move effortlessly from pristine headroom to rich, controlled saturation, while the fully bypassable three-band tube EQ provides precise tonal sculpting with musical curves. A dedicated rear-panel reamp input allows line-level tracks to be driven back through the tube circuitry for harmonic enhancement, with a convenient front-panel REAMP / NORMAL switch for fast source changes. Built with hand-wound transformers, premium components, and meticulous craftsmanship, the RBDI is a no-compromise tube DI and tone-shaping centerpiece for serious studios.
Mystery Magicians RBDI Rackmount Tube Direct Box Features
- Fully tube-based, Class A direct box and instrument preamp
- High-voltage design running 12AU7 tubes at 320V (no starved plates)
- 1U rackmount chassis for studio and touring rigs
- Hi-Z instrument input for passive and active pickups
- Switchable High / Low Gain front end for clean headroom or saturation
- Up to 53 dB of maximum gain for instruments and high-impedance microphones
- True bypassable 3-band tube EQ
- Bass ±15 dB
- Mid ±6 dB
- Treble ±10 dB
- Intelligent Bright switch tied to input gain for clarity at low levels and smoothness at high gain
- Dedicated Reamp XLR input for processing prerecorded tracks and stems
- Front-panel REAMP / NORMAL switch for instant source selection
- Phase reverse switch
- Ground lift switch
- Front THRU output for amps, tuners, or parallel processing
- -20 dB balanced output pad for safe interface levels while driving tubes hard
- Auto-sensing international power supply (86–260 VAC)
Mystery Magicians RBDI Rackmount Tube Direct Box Specifications
- Circuit Type: All-tube, Class A
- Tubes: Philips ECG NOS 12AU7
- Hi-Z Input Impedance: 1 MΩ
- Reamp Input Impedance: 100 kΩ balanced
- Maximum Gain:
- High Gain: 53 dBuL
- Low Gain: 32 dBu
- Reamp Input: 10 dBu
- Output Impedance: 150 Ω balanced
- Frequency Response: 5 Hz – 50 kHz (±0.5 dB)
- Maximum Output Level: +22 dBu @ 1% THD+N
- THD+Noise @ +4 dBu: 0.02% (second harmonic dominant)
- Power Requirements: 86–260 VAC, 50–60 Hz
Mystery Magicians RBDI Rackmount Tube Direct Box Includes
- Mystery Magicians RBDI Rackmount Tube Direct Box
- IEC Power Cable
- Manufacturer Warranty
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