Item # J00704 | Customer Ratings: ( 5 Based on 1 reviews)

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Heritage Audio '73 Junior 500 Series Microphone Preamp
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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.

Heritage Audio '73 Junior 500 Series Microphone Preamp Features:

  • 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
    Marconi style knobs and vintage style engraved pushbuttons

Heritage Audio '73 Junior 500 Series Microphone Preamp 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 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.

Product Reviews
(Based on 1 reviews)
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  • Heritage Audio 73jr

    As reviewed by Justin on 12/10/2014

    The 73jr is my first module for my new Lindell Audio 503 500 series chassis. Though I have used a wide variety of console pres, 18" rack pres, and desktop pres in professional environments, this is the first that I have used in my personal recording setup. Previously, I was using the Focusrite 2i2, and I am currently using an Apogee Duet. Switching to the Apogee was a huge step up; the converters are so much cleaner, the mic pres are smoother and more detailed, and they stack nicely. When I plugged the 73jr into the Apogee and bypassed the internal preamps on the interface, I was able to hear an immediate difference. I run the output knob all the way up, and adjust the input gain until I get proper recording levels, then I'll attenuate with the output knob if needed. It's so warm, and smooth. The preamp seems to iron out any harsh frequencies, leaving me with a sound that I can just "drop" right into the mix. My first signal to run through it was distorted guitar; there is so much space around the instrument, as if it's picking up the sound of the speaker and the cabinet. As I push the input knob and roll back the output knob, the sound gets brighter and fatter at the same time. It also has this smear to the signal that is very pleasing to the ears. It's hard to beat the Apogee pres; they are still good for a transparent sound, but the 73 truly has a character of it's own. It's hard to explain, it just works better. A lot better. When ou start to stack tracks through it, that's when it all comes together, and you sit back, and it just sounds huge. It sounds like a record.

    2 of 2 people found this review helpful.
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PO Box 4769
Westlake Village, CA 91359
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