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Telefunken TDP-1 – Passive Mono DI Box with Custom Wound Transformer

The Telefunken TDP-1 is a premium-quality passive direct injection (DI) box, designed to deliver exceptional audio performance in both studio and live sound environments. Ideal for electric guitars, basses, keyboards, and other instruments, the TDP-1 captures every nuance of your source with clarity, punch, and character.

At the heart of the TDP-1 is a custom-wound Telefunken transformer, ensuring maximum signal integrity, wide frequency response, and ultra-low distortion. Its passive design requires no external power and provides natural impedance matching between your instrument and mic preamp, while also offering galvanic isolation to eliminate hum and ground loop noise.

Built with rugged construction and high-grade components, the TDP-1 is road-ready and built to last, making it a trusted tool for professional engineers and touring musicians alike. With its compact footprint and classic Telefunken build quality, this DI box is a no-compromise solution for clean, musical signal conversion.

Key Features:

High-performance passive DI box
Mono design – perfect for individual instruments
Custom-wound Telefunken transformer for warm, accurate tone
Transformer-isolated output eliminates ground loops and hum
Rugged aluminum chassis – roadworthy and durable
Passive design – no batteries or phantom power required
Made in the USA with Telefunken’s renowned craftsmanship

Technical Specifications:

Type: Passive DI Box
Input: 1 x 1/4″ TS instrument
Output: 1 x XLR (transformer-isolated)
Thru: 1 x 1/4″ TS (parallel output)
Frequency Response: 20 Hz – 20 kHz ±1 dB
Impedance: 140kΩ (input), 150Ω (output)
Dimensions: Compact road-ready design
Power: Passive – no power required

Why Choose the Telefunken TDP-1?

If you’re seeking a reliable, great-sounding DI solution that brings out the best in your instruments, the Telefunken TDP-1 is an exceptional choice. From studio recording sessions to world tours, it offers the kind of performance and durability professionals demand. With its transformer-balanced output and noise-free operation, it ensures your signal stays clean and full of character.

Capture your tone with clarity and confidence—choose the Telefunken TDP-1.