73DI ONE | HA-73DI-ONE

73DI ONE

Art.-Nr.: HA-73DI-ONE

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Formed in 2011 by group of sound and electronics engineers with +45 years of combined experience in the Pro Audio world, Heritage Audio brings a new flavor to the high end studio equipment market. Combining a vintage look and sound with key features not found in ancient equipment, Heritage Audio adds some spice to 1970s Series 80 consoles and outboard racks, expanding the sonic palette of any professional or home studio.

Overview

Single channel active DI box

The 73DI ONE is a single channel high-fidelity, transformer-isolated active DI box based on the legendary 73 topology, re-engineered for modern professional audio applications. Designed around a Class A, 3055-driven output stage with a custom silicon steel grain-oriented output transformer, the 73DI ONE delivers the warm, dynamic, and richly saturated tone, known from the iconic vintage 73 preamps.

The 73DI ONE adopts the legendary 3-transistor topology circuit of the 73 preamps with a J109 JFET as first transistor to achieve a high 2.2 megohm input impedance and a 2n3055 metal can output transistor to drive the custom-developed silicon steel grain-oriented output transformer. Being a transformer based unit, its output is isolated from the instrument and with the ground lift switch, noise and interference can also be eliminated. An additional 15dB PAD switch helps with hotter instruments and even allows speaker outputs to be plugged into the 73DI ONE. A THRU parallel connection a for forwarding the input signals is also available. All jacks and XLR are gold plated and isolated from chassis. An attractive yet protective extruded aluminum case makes the 73 DI ONE virtually indestructible and totally roadworthy, with all connections recessed for foolproof operation.

This meticulously engineered design is what gives the 73 DI ONE its outstanding performance, delivering a rich, dynamic direct sound that fully captures the harmonic complexity of any instrument and even pre-recorded tracks. Ideal for guitars, basses, keyboards, synths, drum machines, and samplers, the 73DI ONE brings out the true voice of every instrument - enhancing passive basses with punch and presence, revealing the full body of a Fender Rhodes, and adding rich saturation to Wurlitzer EPs.

Product Details

Dual channel active DI box
Class A, JFET discrete input stage as seen on all Heritage Audio top of the line products
Low impedance custom Heritage Audio designed 73-DI output transformers
Outstanding signal integrity and superior noise rejection
Rugged 14-gauge steel enclosure prevents PCB stress and potential component failure
MIL-spec circuit board with full ground plane for ultra-quiet operation
Durable metal switches rated for over 25,000 cycles
15dB pad
Ground lift switch
Input / Thru gold-plated jacks
Gold-plated XLR output
Operated by standard +48V phantom power with red LED indicator light

Balanced 1/4" TRS

2.2 MΩ

Transformer balanced XLR, balanced 1/4" TRS (THRU)

Yes (switchable)

-15 dB (switchable)

Phantom power (48 V) via XLR output

130 x 77 x 50 mm

558 g