Heritage Audio HA-73 Elite Series Mono Microphone Preamp User Manual
- October 29, 2023
- Heritage Audio
Table of Contents
Heritage Audio HA-73 Elite Series Mono Microphone Preamp
INTRODUCTION
Thank you for choosing the 73 EQ JR. 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 by us
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
All the EQ you should ever need
The 73 EQ JR is a fully featured Line Input module for the 500 Series.
It not only shares the 3-band Equalizer with his big brother, the Heritage
Audio 73 80 Series, but also shares the same transformer coupled line preamp
and Class A transformer balanced output stage.
These facts make the 73EQ JR unique on its class, being able to capture a full
transformer based, Class A sound without relying on external preamps.
The Equalizer features the same Baxandall type High and Low shelf found in the
HA73 80 Series, with the addition of a high frequency selector switch. 4
different frequencies are possible instead of the fixed 12 kHz one.
The mid band is the same exact dual inductor one, thick low and sweet high
midrange boosts without becoming muddy or brittle.
The line preamp has a range of +6 to -20 dB, allowing heavy eq boosts without
overloading A/D converters.
Finally, special care has been taken with power handling, implementing
internal +24 V slow turn on regulation (about 20 seconds to reach full
voltage). This makes your 73 EQ JR independent of the rest of the slots and
makes your lunchbox´s PSU happier.
GETTING STARTED
Front
| 1 | 2 | 3 | 4 | 5 |
|---|
D.I. INPUT
High Impedance Class A JFET
| INPUT GAIN SWITCH
5 dB Steps From 30 to 80
| MIC PAD
20 dB Reduction Ahead of Input Transformer
| PHANTOM POWER
Activates 48 V
| HIGH PASS FILTER
-3 dB at 82 Hz, Discrete Class A
| 6 | 7 | 8 | 9 | 10 |
|---|
OUTPUT ATTENUATOR
Attenuates from 0 to Infinity
| MIC INPUT IMPEDANCE
1200 Ω or 300 Ω when pressed
| LINE
Switches from MIC/D.I. to Line
| PHASE
Flips phase 180º
| POWER
Activates Unit
REAR
| 1 | 2 | 3 | 4 |
|---|
POWER INPUT
To Be Connected to the HA PSU04 Power Supply
| LINE OUTPUT
Male XLR Connector
| LINE INPUT
Female XLR Connector
| MIC INPUT
Female XLR Connector
All XLRs are:
- P in 1: GND
- Pin 2: Hot
- Pin 3: Cold
D.I. Jack:
- T ip: Signal
- Sleeve: Ground
APPLICATIONS
MIC
D.I. 
LINE
SPECIFICATIONS
- Microphone input impedance: High=1200 Ω minimum; Low=300 Ω minimum. Higher gain positions gradually have greater impedances, optimum for low gain ribbon mics. Input is transformer balanced and floating.
- 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
TROUBLE SHOOTING
| PROBLEMS | SOLUTIONS |
|---|---|
| There doesn´t appear to be any signal at all arriving at the back XLR. | Make |
sure the GAIN knob is not in the ´Off´ position.
There still doesn´t appear to be any signal at all arriving at the back XLR.|
Check to see if a jack cable has been left plugged into the front panel D.I.
Even at the lowest position on the GAIN knob I still have too much gain.| When
this happens you should activate the PAD button. This will reduce the input by
20dB ahead of the input transformer.
Condenser microphones don´t seem to work with HA-73.| Make sure the red +48 V
button is pressed in to activate the phantom power sent to the microphone.
There doesn´t seem to be any output at all from the unit.| Check to see if the
OUTPUT knob is fully turned down as this will attenuate the signal completely.
Sending a signal to the unit from a DAW overloads it terrible.| It is
necessary to press the LINE button when sending it a line level source.
If not, it is expecting a Microphone signal with a very different impedance.
- For any further doubts or questions please get in contact with us at: support@heritageaudio.com
WARRANTY STATEMENT
LIMITED 2 YEAR WARRANTY
Heritage Audio 73 EQ JR is warranted by Heritage Audio SL to be free from defects in materials and workmanship for the period of 2 years to the original purchaser. In the event of such defects, the product will be repaired without charge or, at our option, replaced with a new one if delivered to Heritage Audio prepaid, together with a copy of the sales slip or other proof of purchase date. The warranty excludes problems due to normal wear, abuse, shipping damage or failure to use the product in accordance with the specifications.
Heritage Audio shall not be liable for damages based upon inconvenience, loss of use of the product, loss of time, interrupted operation or commercial loss or any other damages, whether incidental, consequential or otherwise.
This warranty is not transferable.
REGISTRATION
Please visit our website: https://heritageaudio.com/registration/
RECALL SHEETS
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Date:
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Session / Title:
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Instrument:
Notes:
Switch ON
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HERITAGE AUDIO. C/ Alfonso Gómez, 38, 3C. 28037 Madrid – Spain. Tel: +34 917
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