Item #: HEA 73JR LIST

Heritage Audio 73Jr 500 Series Microphone Preamplifier

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Product Description

The ‘73JR is true 1073 style mic preamp in a single 500 series slot with some added features that will cover all the recording needs for engineers and musicians that don´t find the need to track with eq. Employing only discrete circuitry and conventional components, the ‘73 junior is a faithful 3 stage all class A 1073 preamp. Styroflex and tantalum capacitors have been used throughout. No corners were cut.

A useful all discrete class A hi pass filter has been added, essential for recording everything with the exception of probably kick drum and and bass.

The Line mode allows for reamping of prerecorded tracks and it´s perfect for adding some class A color to lifeless recordings.

The smart switched DI (automatically switches from MIC to DI mode when inserting a MONO 1/4 inch jack) is an all discrete class A JFET circuit ahead of the MIC transformer, so all the juice is there. Since its introduction in 2013, it has become a classic DI for bass.

Finally, special care has been taken with power handling, implementing internal +24v slow turn on regulation (about 20 seconds to reach full voltage).This makes your 500 series enclosure´s power supply healthier and makes the ‘73JR independent of the rest of the slots.

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Helpful Info about the Manufacturer
Phone:  34 917 266 189 Warranty:  2 Years

Product Specifications

Heritage Audio 73Jr 500 Series Microphone Preamplifier Specifications
  • Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions gradually have greater impedances, optimum for lo gain ribbon mics. Input is transformer balanced and floating.
  • Line input impedance: 10K Ohms bridging, transformer balanced and floating.
  • DI input impedance: Greater than 2 Megohms, unbalanced.
  • Output impedance: Less than 75 Ohms, transformer balanced and floating, to drive a load of 600 ohms (factory terminated).
  • Maximum output: Greater than +26dBu into 600 ohms.
  • THD: Less than 0.025% at 1 Khz, less than 0.05% at 100Hz.
  • Frequency response: 20Hz ( +0.3dB ) to 20Khz (-0.2dB)
  • Maximum gain: Slightly greater than 80dB
  • Noise: Less than -100dBu.
  • Power consumption: 88 mA per rail @+-16VDC.

Customer Reviews

Review: Carl Moore Music, Submitted: 7/24/2018

Product Rating5 out of 5 stars.



A beast of a Preamp
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Product Review

The Neve 1073 is one of the most widely used and highly sought after preamp of the audio recording world. It’s can be heard in many genera’s and has been used on so many sources to capture the best sonic quality as possible. When I saw that this unit was specifally modeled after such an iconic piece, I was super eager to grab one. My first test was on vocals. The full body that emerged from my level check was exciting and out the gate I knew I was in for success. I’ve tried a few other pres that lack the head room you get with the HA-73jr and that was no problem here from a ribbon mic, dynamic or condenser. Mid range got a nice bear hug to me that wasn’t over bearing at all. I got curious and ran a lower quality LDC through it with typically harsh top end. The HA-73jr handled it well and surprised a few peers who frequently record with top end gear and mics. Overall, you have to hear what works best for your setup but I know this piece made a permanent place for itself! Get one!!!


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