Heritage Audio 73 EQ JR User manual

USER MANUAL
73 EQ JR
August/2022)Rev.)1.0.)
3 BAND EQ
500 Series Module

2
INTRODUCTION
CONTENTS
DESCRIPTION
GETTING STARTED
APPLICATIONS!
SPECIFICATIONS!
SIGNAL FLOW!
TROUBLE SHOOTING
WARRANTY STATEMENT
REGISTRATION!
RECALL SHEETS
2
2
3
4
5
6
6
7
8
8
9
TABLE OF CONTENTS
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
INTRODUCTION
© 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.
73 EQ JR

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.
3

GETTING STARTED
4
6
7
8
HIGH SHELF GAIN
±16 dB
MID PEAK BAND GAIN
±18 dB
LOW SHELF GAIN
±16 dB
FRONT
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
REAR
1
SLOT CONNECTOR
Gold Plated
1
500 SERIES CONNECTOR
+!
OUTPUT + (4 LEVEL)
OUTPUT - (4 LEVEL)
INPUT - (4 LEVEL)
INPUT + (4 LEVEL)
GND
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
3
4
2
1
5
6
7
8

5
MIC - EQ
APPLICATIONS
ACTIVATE LINK SWITCH (SLOT 1)
USB - COMPUTER
LINE INPUT - AUDIO INTERFACE
ACTIVATE +48V FOR CONDENSER MIC
OUTPUT 2
INPUT 1
73 EQ JR
SLOT 2
CONDENSER MIC
INSERT SETUP
73 JR II
SLOT 1
THUNDERBOLT
COMPUTER
MONITOR
SPEAKERS
LINE
OUTPUTS
LINE
INPUTS
Recommended setup
to insert EQ processing
on individual tracks.

SPECIFICATIONS
• Input impedance: 10 kΩbridging, transformer balanced and floating.
•Output impedance: Less than 75 Ω, transformer balanced and floating, to drive a load of 600 Ωload.
•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.
6
SIGNAL FLOW
LINE INPUT
LINE OUTPUT
OUTPUT AMP
INPUT AMP
EQUALIZER

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.
7
* For any further doubts or questions please get in contact with us at: [email protected]!

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
8
Please visit our website:
WARRANTY STATEMENT
https://heritageaudio.com/registration/

RECALL SHEETS
9
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: [phone]
[email protected]