A-Designs REDDI – All-Tube Direct Box (DI) for Bass, Guitar & Keyboards
The A-Designs REDDI is one of the most celebrated tube direct boxes ever made — a professional-grade DI designed to give instruments the warmth, depth, and harmonic richness of a classic studio tube preamp.
Built around a 6N1P tube amplification stage and a massive custom-wound output transformer, the REDDI turns any direct signal — bass, guitar, keys, or synth — into a full-bodied, record-ready tone that sits perfectly in the mix.
Praised by top engineers and session players around the world, it’s the DI of choice for anyone seeking vintage analog tone and unmatched sonic character.
Key Features
- All-tube Class A design featuring a single 6N1P vacuum tube for rich harmonic detail.
- Custom-wound Cinemag output transformer for deep lows and silky high-end clarity.
- Balanced XLR output for professional line-level connection to mic preamps or consoles.
- ¼” Thru output to send the unaffected signal to an amp or monitor system.
- Ground lift switch for noise-free operation in complex studio or live setups.
- Rugged, road-ready steel chassis for years of reliable performance.
- Active tube circuitry provides warmth, fullness, and subtle compression even on DI sources.
- Perfect for bass, guitar, keyboards, synths, and studio re-amping applications.
- Hand-built in the USA using premium-grade components and transformers.
Applications
- Bass Guitar: Delivers studio-ready low end with thick, round tone and tube saturation.
- Electric Guitar: Adds weight and analog color to direct recordings or re-amping chains.
- Keyboards & Synths: Adds warmth and depth to sterile digital signals.
- Acoustic Instruments: Enhances body and realism in piezo-equipped pickups.
- Live Sound: Provides robust, noise-free DI signal with musical analog character.
Technical Specifications
| Unit Type | All-Tube Direct Box (DI) |
|---|---|
| Circuit Type | Class A, high-voltage tube design with transformer-balanced output |
| Tube Complement | 1 × 6N1P dual-triode vacuum tube |
| Input | ¼” TS unbalanced (Instrument Input) |
| Thru Output | ¼” TS unbalanced (Amp/Monitor Out) |
| Balanced Output | XLR (Mic/Line Level) |
| Frequency Response | 20 Hz – 60 kHz ±1 dB |
| Output Impedance | 600 Ω balanced |
| Input Impedance | 1 MΩ |
| THD + N | 0.08% typical @ +4 dBu |
| Power Requirements | 115/230V AC (internal power supply, no wall wart) |
| Dimensions | 13” × 5.5” × 3” (330 × 140 × 76 mm) |
| Weight | Approx. 4.5 kg |
| Origin | Hand-built in the USA by A-Designs Audio |
Why Choose the A-Designs REDDI?
The A-Designs REDDI is more than just a DI box — it’s a tone-shaping powerhouse trusted by professional bassists, producers, and engineers worldwide.
Its all-tube design and Cinemag transformer deliver warmth, weight, and depth unmatched by solid-state units.
Whether used in the studio or on stage, REDDI adds the unmistakable analog dimension and harmonic richness that make your direct signal feel alive and record-ready.