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Heritage Audio '73 Junior 500 Series Microphone Preamp   

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Following the success of the 1073/500 module, the '73 JR is a mic preamp in a single 500 series slot with some added features that will cover all the...Click To Read More About This Product

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Slimmed down version of the 1073/500 module.

Following the success of the 1073/500 module, the '73 JR is a 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 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 ¼" jack ) is an all discrete class A JFET circuit ahead of the MIC transformer, so all the juice is there. 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 lunchbox PSU healthier and makes the 73JR independent of the rest of the slots.

  • 80dB Class A Microphone preamplifier
  • HI-LO selectable minimum input impedance, balanced and floating
  • High gain positions show a higher impedance, ideal for old ribbon mics
  • 50Db Class A Line preamplifier, bridging input impedance, balanced and floating
  • All discrete Class A Ultra High Impedance J-Fet Direct Input on a high quality Neutrik Jack
  • Class A single ended, 2N3055 driven, high headroom output stage
  • PAD: 20dB Mic input attenuation ahead of the input transformer to avoid overloading it
  • HI PASS FILTER: Active all discrete Class A 3rd order Bessel, 80Hz Hi Pass Filter 18dB/octave slope
  • OUTPUT control to allow overloading of the preamp
  • Internal slow turn-on +24v power supply for lower inrush current, which improves your lunchbox performance
  • Carnhill Input and Output transformers
  • 3 gain stage, genuine modular card construction. All active circuitry is on pluggable cards for easier service

If you don't need to track with EQ, then the '73 JR is the right choice for you.


'73 Junior 500 Series Microphone Preamp

  • 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 Carnhill transformer balanced and floating.
    Line input impedance: 10K Ohms bridging, Carnhill transformer balanced and floating.
    DI input impedance: Greater than 2 Megohms, unbalanced.
    Output impedance: Less than 75 Ohms, Carnhill transformer balanced and floating, to drive a load of 600 ohms (factory terminated).
    Maximum output: Greater than +26dBm 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 -100dBm.
    Power consumption: 88 mA per rail @+-16VDC.

Review Snapshot

by PowerReviews
Heritage Audio'73 Junior 500 Series Microphone Preamp

(based on 2 reviews)

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Reviewed by 2 customers

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(1 of 4 customers found this review helpful)



By core64

from Boston

About Me Experienced

Verified Buyer


  • Clear Sound
  • Easy To Use
  • Professional Functions
  • Versatile


  • None

Best Uses

  • Amateur Recording
  • Home Studio
  • Professional Recording

Comments about Heritage Audio '73 Junior 500 Series Microphone Preamp:

I was looking for a mic pre that would add warmth to my digital recordings, and this pre hits the bulls-eye. I never had the pleasure of recording with a true Neve, so can compare it to that, but do love this mic pre!

(9 of 13 customers found this review helpful)


Incredible sounding... but...


from Iowa

About Me Experienced


  • Clear Sound
  • Easy To Use
  • Powerful
  • Professional Functions


  • Hard To Get A Perfect One

Best Uses

  • Home Studio
  • Professional Recording

Comments about Heritage Audio '73 Junior 500 Series Microphone Preamp:

Ok, I'll cut to the chase. This is one incredibly NICE sounding preamp. BUT... I do have a complaint.

I have 2 of these units. The first one is awesome & I love it.

The second one... well... it had a speaker-destroying loud POP/CHIRP when selecting between 50 & 55 db on the gain selector knob. I assumed it was defective, so I exchanged it for another one. Same problem, AND the faceplate was scratched down to the metal.

So, I exchanged the replacement for yet another one. Same loud popping problem AGAIN... ALSO with chipped paint on the faceplate.

Now, I didn't buy these from Musician's Friend... I just wanna state that, to be fair. The place I ordered from, contacted Heritage Audio & got a response that this loud pop is normal. I want to pull my hair out!!

Other "true" 1073 clones usually have a muted spot between this setting (now I know why).

So, long story short, I'm not happy with Heritage Audio & I regret this purchase. There are other quality 1073 clones that won't destroy your studio monitors. Also, for this kind of money (especially since it's not mass produced), it should be IMMACULATE out of the box.

So the bottom line is: In my experience, I had a 25% success rate with these (1 good one & 3 in a row with problems).

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