Heritage Audio Ha-73 Elite Series Mono Microphone Preamp User Manual (+ PDF)

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1 Heritage Audio HA-73 Elite Series Mono Microphone Preamp

2 INTRODUCTION

3 DESCRIPTION

3.1 All the EQ you should ever need

7.1 LIMITED 2 YEAR WARRANTY

7.2 REGISTRATION

8 Documents / Resources

8.1 References

9 Related Posts

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: [email protected]

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.