HA-73 Mono Microphone Preamp

Introduction

Thank you for choosing the Elite Series HA-73. Heritage Audio is dedicated to bringing you 'the sound of yesterday for tomorrow'. We specialize in capturing that unique, enticing sound that everybody has fallen in love with. For years engineers, producers and musicians have been yearning for that classic vibe. Usually the only option is to search for old, used original equipment that is almost always in a questionable state of operation. This brings with it a whole lot of other issues, making the experience less than desirable. Not to mention the very high prices asked for this equipment, which makes them virtually unobtainable for the great majority. Now it's possible to obtain that same sound with a brand new piece that will give you all the problem-free, heavy-duty use you'll need for years of music making history.

Peter Rodriguez
CEO
Heritage Audio - Madrid, Spain

© 2022 Heritage Audio S.L. is the sole owner of the copyright of all information and drawings contained in this manual which are not to be copied or reproduced by any means or disclosed in part or whole to any third party without written permission. Heritage Audio reserves the right to alter specifications without notice. The information in this manual has been carefully checked and is believed to be accurate at the time of publication. However, no responsibility is taken for inaccuracies, errors or omissions nor any liability assumed for any loss or damage resulting either directly or indirectly from use of the information contained within it.

Description

The HA-73 Elite single channel microphone preamp is made to the same specifications as the acclaimed 73 JR II and DMA 73 Heritage Audio models at an unheard of price. Using expertise and reputation from its popular time-consuming hand-soldered series, HA offers a zero-compromise, high-quality, yet very affordable alternative to growing entry-level brands. A combination of lean manufacturing, modern construction techniques, and mass production minimizes hand labor and associated costs, especially when manufacturing takes place in Western Europe. By passing savings to end-users, Heritage Audio releases the most affordable outboard preamps and equalizers in its class.

Key components for a true vintage sound are maintained, including the industry-standard Carnhill transformers, hand-wound in St Ives, England.

Manufactured in the same Spanish facilities as the rest of the HA line, the rack-mountable HA-73 Elite presents the classic-sounding recording preamp, regarded for generations for its rich, musical qualities and ability to dramatically improve the sound of almost any source.

It includes the same great-sounding JFET DI circuit found in the 73 JR II and a fully discrete Class A high pass filter.

With 80dB of available gain and dedicated mic, line, and instrument inputs, the HA-73 Elite provides everything needed to bring microphones and instruments to life with vintage vibe and thickness.

The HA-73 Elite features gain, output trim, -20 dB pad, polarity reverse, a high pass filter, and +48 V phantom power. It is housed in a rugged 1RU British steel chassis and utilizes an external power supply for low-noise operation. The HA-73 features Carnhill input and output transformers, high-quality pots and switches, and is 100% made by Heritage Audio.

Getting Started

Front Panel Controls

1. D.I. INPUT

High Impedance Class A JFET

2. INPUT GAIN SWITCH

5 dB Steps From 30 to 80

3. MIC PAD

20 dB Reduction Ahead of Input Transformer

4. PHANTOM POWER

Activates 48 V

5. HIGH PASS FILTER

-3 dB at 82 Hz, Discrete Class A

6. OUTPUT ATTENUATOR

Attenuates from 0 to Infinity

7. MIC INPUT IMPEDANCE

1200 Ω or 300 Ω when pressed

8. LINE

Switches from MIC/D.I. to Line

9. PHASE

Flips phase 180°

10. POWER

Activates Unit

Rear Panel Connections

1. POWER INPUT

To Be Connected to the HA PSU04 Power Supply

2. LINE OUTPUT

Male XLR Connector

3. LINE INPUT

Female XLR Connector

4. MIC INPUT

Female XLR Connector

XLR and D.I. Jack Information

All XLRs:

• Male XLR: Pin 1: GND, Pin 2: Hot, Pin 3: Cold
• Female XLR: Pin 1: GND, Pin 2: Hot (+), Pin 3: Cold (-)

D.I. Jack:

• Tip: Signal
• Sleeve: Ground/Shield

Applications

Microphone (MIC) Application

Connect a condenser microphone to the MIC INPUT. Activate +48V Phantom Power if required. The output is connected to the audio interface's LINE INPUT via a cable.

Direct Input (D.I.) Application

Connect a guitar or instrument (e.g., via a guitar FX pedal) to the D.I. INPUT. The output is connected to the audio interface's LINE INPUT via a cable.

Line Input Application

Connect a line-level source, such as a keyboard's LINE OUTPUT, to the HA-73's LINE INPUT. Ensure the LINE switch is activated. The output is connected to the audio interface's LINE INPUT via a cable.

Specifications

• Microphone Input Impedance: High=1200 Ω minimum; Low=300 Ω minimum.
• Line Input Impedance: 10 kΩ bridging, transformer balanced and floating.
• Output Impedance: Less than 75 Ω, transformer balanced and floating, to drive a load of 600 Ω.
• D.I. Input Impedance: Greater than 2 MΩ, unbalanced.
• Maximum Output: Greater than +26.5 dBu into 600 Ω (internally terminated).
• 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 greater than 80 dB.
• Equivalent Input Noise: Less than -125 dBu.
• Output Stage Noise: Less than -100 dBu.
• Power Consumption: Less than 95 mA @ 48 V DC.
• Dimensions (W x H x L): 482 mm x 44 mm (1 Rack unit) x 184 mm.

Signal Flow

The signal path is as follows: MIC/LINE INPUT -> PAD -> LOZ -> INPUT AMP -> HIGH PASS FILTER -> OUTPUT AMP -> PHASE -> LINE OUTPUT. The D.I. input also feeds into the INPUT AMP.

Troubleshooting

For further questions, contact: support@heritageaudio.com

Warranty Statement

Limited 2 Year Warranty

Heritage Audio HA-73 is warranted by Heritage Audio SL against defects in materials and workmanship for 2 years from the original purchase date. Defects will be repaired or the unit replaced at Heritage Audio's option, provided it is returned prepaid with proof of purchase. The warranty excludes damage from normal wear, abuse, shipping, or failure to use the product according to specifications.

Heritage Audio is not liable for damages related to inconvenience, loss of use, time, interrupted operation, or commercial loss.

This warranty is not transferable. Heritage Audio and the "H" logos are registered trademarks of Heritage Audio.

Registration

Please visit our website for registration: https://heritageaudio.com/registration/

Recall Sheets

The recall sheets are provided as templates for users to record session details, including Session/Title, Date, Track, Instrument, Connected Equipment, Notes, and Switch status (ON/OFF).

Company Information

Website: www.heritageaudio.com

Address: HERITAGE AUDIO. C/ Alfonso Gómez, 38, 3C. 28037 Madrid – Spain.

Tel: +34 917 266 189

Email: info@heritageaudio.com

Heritage Audio promotes environmental responsibility: REDUCE, REUSE, RECYCLE.