Telefunken TDA-1 Active Mono Direct Box

A High-Quality Active Mono DI for Professional Audio Applications
The Telefunken TDA-1 is a premium active mono direct box designed to deliver clean, high-headroom signal conversion with a rich and natural character. Utilizing discrete Class-A FET circuitry and a custom-wound UK-made OEP/Carnhill transformer, this DI box ensures a perfect balance of clarity, warmth, and precision. Whether used in the studio or on stage, the TDA-1 enhances the natural tone of your instrument while maintaining superior signal integrity.

Class-A FET Circuitry for Transparent and Musical Tone
Unlike DI boxes that provide sterile, ultra-clean gain or overly hyped low-end, the TDA-1 is designed to retain the organic character of your instrument. The discrete Class-A FET circuitry ensures ultra-low noise performance while providing harmonic richness. This design allows the TDA-1 to deliver a balanced signal with detailed highs, clear midrange, and a harmonically rich low end, making it ideal for guitars, basses, keyboards, and other electronic instruments.

Custom-Wound Transformer for Enhanced Signal Quality
At the heart of the TDA-1 is a UK-made OEP/Carnhill transformer, custom-wound to maintain clarity while adding subtle harmonic saturation. This transformer provides a smooth and musical response, ensuring that your instrument’s tone remains intact without coloration. The circuit's frequency response is ±1 dB from 20 Hz to 50 kHz, delivering full-range audio reproduction with minimal distortion.

Rugged Construction for Reliable Performance
Housed in an extruded aluminum enclosure, the TDA-1 is built for durability and long-term reliability. The rugged design protects the internal circuitry from physical damage, making it an excellent choice for gigging musicians and touring professionals. Recessed connectors and switches prevent accidental adjustments, ensuring that your settings remain intact during performances and transport.

Phantom Power Operation with LED Indicator
The TDA-1 is powered via standard +48V phantom power, eliminating the need for external power supplies or batteries. A built-in LED indicator confirms when phantom power is active, ensuring seamless integration into any professional audio setup. This feature makes it easy to use in any recording studio, live sound rig, or broadcast environment.

Built for Versatility in Studio and Live Sound
Designed to handle a variety of sources, the TDA-1 is an excellent choice for both active and passive instruments. It features a high input impedance to prevent loading down passive pickups, preserving the natural dynamics of your instrument. With its transparent yet warm sonic signature, the TDA-1 is an essential tool for engineers and musicians looking for professional-quality DI performance.

Hand-Assembled for Superior Quality and Performance
Each TDA-1 unit is meticulously hand-assembled with premium components, including gold-plated circuit traces, Amphenol connectors, and WIMA, Nichicon, and Panasonic capacitors. The circuit uses 100% through-hole components for secure and reliable connections, ensuring optimal performance in any environment. Every unit is manually tuned for the lowest possible distortion, guaranteeing the highest level of sonic integrity.