Heritage Audio 73 EQ JR 500 Series 3-band EQ Module User Manual
- June 9, 2024
- Heritage Audio
Table of Contents
Heritage Audio 73 EQ JR 500 Series 3-band EQ Module
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
| 1 | 2 | 3 | 4 | 5 |
|---|
LINE INPUT GAIN
From +6 to -20 dB| HIGH SHELF
Frequency Selector: 10, 12, 16, 20 kHz| MID PEAK BAND
Frequency Selector: 0.36, 0.7, 1.6, 3.2, 4.8, 7.2 kHz| LOW SHELF
Frequency Selector: 30, 60, 110, 220 Hz| EQL
Activates Equalizer
| 6| 7| 8|
HIGH SHELF GAIN
±16 dB| MID PEAK BAND GAIN
±18 dB| LOW SHELF GAIN
±16 dB
REAR
APPLICATIONS
MIC – EQ
INSERT SETUP 
SPECIFICATIONS
- 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 load.
- Maximum output: Greater than +26 dBu into 600 Ω.
- THD: Less than 0,025 % at 1 kHz, Less than 0,05 % at 100 Hz.
- Maximum Gain: 6 dB.
- Power consumption: Less than 85 mA per rail @ ±16 V DC.
- Dimensions (W x H x L): 38 mm x 135 mm x 150 mm.
SIGNAL FLOW
TROUBLE SHOOTING
| PROBLEMS | SOLUTIONS |
|---|---|
| There doesn´t appear to be any tonal change at all from the 73 EQ JR. | Make |
sure the GAIN knob is not in the ´Off´ position.
There still doesn´t appear to be any tonal change at all from the 73 EQ JR.|
Check to see if the EQL button has been pushed to activate it.
Even at the lowest position on the LINE GAIN knob I still have too much gain.|
You will have to reduce the signal level being sent to the 73 EQ JR.
There seems to be a very high output from the unit.| Adjust the LINE GAIN knob
to compensate for any tonal adjustments made that raise the signal too much.
There seems to be a very low output from the unit.| Adjust the LINE GAIN knob
to compensate for any tonal adjustments made that lower the signal too much.
- 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 Session / Title:
Track:
Connected Equipment:
Date:
Instrument:
Notes:
Switch ON
Switch OFF
Session / Title:
Track:
Connected Equipment:
Date:
Instrument:
Notes:
Switch ON
Switch OFF
www.heritageaudio.com
HERITAGE AUDIO. C/ Alfonso Gómez, 38, 3C. 28037 Madrid – Spain. Tel: +34 917
266 189
info@heritageaudio.com