Heritage Audio HA-73 EQ Mono Channel Class A Microphone Preamp 3 Band EQ User Manual
- June 9, 2024
- Heritage Audio
Table of Contents
Heritage Audio HA-73 EQ Mono Channel Class A Microphone Preamp 3 Band EQ
INTRODUCTION
Thank you for choosing the Elite Series HA-73EQ. 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.
IN THE BOX
DESCRIPTION
HA-73 EQ
The HA73EQ Elite is made to the same specifications as the acclaimed 73 JR II,
73EQ JR and DMA 73 Heritage Audio models at a price never heard before.
Leveraging the expertise and reputation obtained with its popular hand wired,
extremely time-consuming hand soldered series, Heritage Audio is able to offer
a zero compromise, high quality yet very affordable alternative to the growing
entry-level brands. A combination of mass production, lean manufacturing and
modern construction techniques, minimizes hand labor and therefore its high
associated costs when manufacturing takes place in Western Europe. By passing
the savings straight into the end users´ pockets, Heritage Audio releases the
most affordable outboard preamps and equalizers in its class up to date. Key
components to obtain a true vintage sound are indeed maintained, like the
industry standard Carnhill transformers, hand wound in St Ives, England.
Manufactured in the same Spanish facilities as the rest of the Heritage Audio
line of products, the HA73EQ Elite rack mountable mic preamp equalizer
presents the complete classic recording channel that, for generations, has
been regarded for its rich, musical qualities and its ability to dramatically
improve the sound of almost any source. No 73 equalizer will present the
correct equalization curves without high quality capacitors and, most
importantly, correct “Vinkor” type pot core inductors. More than often this
type of products have these expensive inductors replaced with generic ferrite
core ones or, even worst, the mid band dual inductor replaced with a single
one. Never in Heritage Audio products!!, as the impact of replacing these to
the eq curves is dramatic, leading to incorrect curve´s shapes and high
frequency phase distortion which in no way honor the design. The HA-73 EQ
Elite employs WIMA 5% capacitors in the EQ section as well as 3 correct
vintage type “Vinkor“ pot core inductors so the eq curves are virtually
undistinguishable from the handmade equalizers in the Heritage Audio line.
Customers can expect the same sonic quality and feel they have come to
appreciate from Heritage Audio. The HA-73 EQ’s preamp section features gain,
output trim, -20 db pad, polarity reverse, a high pass filter, and +48 V
phantom power. The HA-73 EQ’s EQ section features a high shelving EQ,
midrange EQ, low shelving EQ, a variable high pass filter, and EQ Bypass,.
The HA-73 EQ comes housed in a rugged 1RU British steel and aluminum chassis
and utilizes an external power supply for low noise operation.
GETTING STARTED
FRONT
| 1 | 2 | 3 | 4 | 5 |
|---|
D.I. INPUT
High Impedance Class A JFET
| PHANTOM POWER SWITCH
Activates 48 V
| MIC PAD BUTTON
20 dB Reduction Ahead of Input Transformer
| LINE BUTTON
Switches from MIC/D.I. to LINE input
| MIC INPUT IMPEDANCE (LOZ)
1200 Ω or 300 Ω when pressed
6| 7| 8| 9| 10
INPUT GAIN SWITCH
5 dB Steps From 30 to 80
| HI SHELF at 12kHz
Boost or Cut up to 15 dB at 12 kHz
| MID BAND BOOST/CUT
±15 dB of Boost or Cut
| MID BAND FREQUENCIES
Selects frequencies from: 0.36, 0.7, 1.6, 3.2, 4.8 and 7.2 kHz.
An OFF position is also provided to remove the band from the signal path
| LOW SHELF BOOST/CUT
±15 dB of Boost or Cut
11| 12| 13| 14| 15
LOW SHELF FREQUENCIES
Selects frequency for the Low Shelf: 35, 60, 110, 220 Hz
| HIGH PASS FILTER
18dB/Octave 3-pole Filter at selectable frequencies: 50, 80,
160, and 300 Hz. An OFF
position is also provided to remove the filter from the signal path
| OUTPUT ATTENUATOR
Attenuates from 0 to Infinity
| EQL
Turns Equalizer ON and OFF
| PHASE BUTTON
Flips phase 180º
16|
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
APPLICATIONS
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, Carnhill transformer balanced and floating, to drive a load of 600 Ω (Factory terminated).
- 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.
- Output stage noise: Less than -125 dBu.
- Power consumption: Less than 260 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
20 dB ahead of the input transformer.
Condenser HA73EQ.| microphones| don´t| seem| to| work| with| 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.
No matter how I adjust the EQ there doesn´t seem to be any tonal change.| Make sure you have corresponding button.| activated| the| EQ| with| its
- For any further doubts or questions please get in contact with us at: support@heritageaudio.com
WARRANTY STATEMENT
LIMITED 2 YEAR WARRANTY
Heritage Audio HA73EQ 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. Heritage Audio and the Heritage
Audio “H” logos are registered Trademarks owned and/or licensed by Heritage
Audio.
REGISTRATION
Please visit our website: https://heritageaudio.com/registration/
RECALL SHEETS
HERITAGE AUDIO. C/ Alfonso Gómez, 38, 3C. 28037 Madrid – Spain.
Tel: +34 917 266 189
EMAIL: info@heritageaudio.com