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Heritage Audio TT73

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Description

Essential Information About the TT-73 Mic Preamp and DI

  • "73" Color in tabletop format: a channel inspired by the 1073 approach, designed to deliver a dense and musical signature everywhere.
  • True stage and mobility tool: Front DI for sending a "1073-driven" line level to the FOH console, and recording on the go with studio quality.
  • Carnhill transformers on mic/line input and output, for balanced, floating connection and high drive capability.
  • DI THRU + ground lift: simultaneous use of an instrument amp and direct output, while minimizing hum risks related to ground loops.

From the DMA73 spirit to the TABLETOP 73 format: the same philosophy, more playgrounds

TT-73 stands for "TABLETOP 73": it is, in essence, a DMA73 reformatted into a 1-channel version, designed to extend uses beyond the control room. While a studio preamp often remains stationary, the TT-73 aims for a more versatile approach: on stage, portable systems, "on location" recordings, or even hotel room sessions, without sacrificing serious audio architecture.

This tabletop version emphasizes ergonomics and practicality: the goal is to integrate a "73"-type sound into real modern production contexts, whether to feed a front of house, reduce mic cable lengths, or maintain a coherent chain between stage and recording.

A preamp for musicians, live engineers, and mobile studios

The TT-73 is aimed at musicians who want to control their level and tone before the console, notably via the front DI inputs: ideal for bass, guitar, keyboards, or any instrument-level source. In live situations, this allows sending the FOH engineer a signal already enhanced, with comfortable headroom, while keeping a simple and quick setup.

In recording, it becomes a natural ally for mobile setups: a stage mic can be raised to line level without resorting to long cables that may add noise or losses. For vocals, acoustic instruments, and dynamic sources, the wide gain range supports both "standard" mics and more demanding models, including certain ribbons, with particular attention to impedance matching.

Key features: connectivity, DI THRU, and noise-conscious power supply

Carnhill transformers: balance, headroom, and tonal coherence

The TT-73 adopts a Carnhill transformer topology on mic input, line input, and output, with a balanced and floating design. The result: a robust connection, excellent compatibility with varied environments (studio, stage, portable racks), and the ability to deliver a solid signal without compression, particularly useful when seeking body and presence.

Front DI, THRU, and ground lift: designed for stage use and simple reamping

A notable innovation in this tabletop series: the addition of DI THRU jacks for simultaneous use of an instrument amplifier and direct output. This approach is ideal for securing a take, managing backline, or maintaining mixing flexibility. A ground lift switch helps prevent ground loops that can introduce hum when connecting multiple devices (amp, console, recorder, interface).

Worldwide power supply: carefully integrated around the transformers

Special attention has been paid to the internal "worldwide" power supply, custom engineered to operate close to the audio transformers without inducing noise. In a compact unit designed for travel, this is essential: it helps maintain low background noise and reliable performance whether working on mains power in a studio, venue, or on the road.

Tabletop design: a true piece of professional gear

The combination of wood and RAF blue-gray steel gives the TT-73 an immediately recognizable identity. Beyond aesthetics, this tabletop format naturally fits on a desk, flight case, or mobile control surface, adding a premium touch in professional or semi-professional production environments.

Technical Specifications

Inputs and Impedances

  • Mic input impedance: HI, minimum 1200 ohms; LO, minimum 300 ohms. Higher gain positions progressively increase impedance, optimized for low-gain ribbon mics. Balanced input via floating Carnhill transformer.
  • Line input impedance: 10K ohms bridging. Balanced input via floating Carnhill transformer.
  • DI input impedance: greater than 2 megohms, unbalanced.

Output

  • Output impedance: less than 75 ohms, balanced via floating Carnhill transformer, designed to drive a 600-ohm load (factory termination).
  • Maximum output level: greater than +26 dBm into 600 ohms.

Audio Performance

  • THD: less than 0.025% at 1 kHz; less than 0.05% at 100 Hz.
  • Frequency response: 20 Hz (+0.3 dB) to 20 kHz (-0.2 dB).
  • Maximum gain: slightly above 80 dB.
  • Noise: below -100 dBm.
Brand reference number: HATT73
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