Heritage Audio '73 Junior API 500 Series Microphone Preamplifier Module

Heritage Audio '73 Junior API 500 Series Microphone Preamplifier Module

Heritage Audio '73 Junior API 500 Series Microphone Preamplifier Module

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Expected availability: 7-14 business days

Product Highlights

  • 1U Module Fits API 500 Series Lunchbox
  • 80 dB Class A Microphone Preamplifier
  • 50 dB Class A Bridgeable Line Amplifier
  • Balanced and Floating Input Impedance
  • 20 dB Microphone Attenuation Pad
  • 18 dB per Octave 80 Hz High-Pass Filter
  • Internal Slow Turn-On +24V Power Supply
  • 3 Gain Stage Modular Card Construction
  • Carnhill Input and Output Transformers
  • Marconi-Style Knobs and Engraved Buttons
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Heritage Audio 73 JR overview

  • 1Description

The Heritage Audio '73 Junior API 500 Series Microphone Preamplifier Module is a 1U 500 series compatible 80 dB microphone and 10 dB line recording reproduction module based on the vintage 1073 designed by Rupert Neve. The remake is intended for recording engineers who want the classic Neve sound but do not need the equalizer functionality of the original module.

Using Styroflex and tantalum capacitors, the designers were able to fit all three 1073 discrete component Class A preamplifier gain stages in 1U of an API 500 Series lunchbox module.

The preamplifier supports selectable HI-LO minimum balanced and floating input impedances that accommodate a range of microphone types including vintage ribbons. You can also switch the module into line mode to re-amplify pre-recorded tracks and add color to a mix. Plugging in a mono 1/4" input into the DI port on the front of the unit automatically switches the module from MIC to DI mode. A discrete component Class A 3rd order 80 Hz high-pass filter with an 18 dB per octave slope has been added for recording sources without the effects of low-frequency coloration. An output control knob is included to prevent overloading the preamplifier.

The unit is powered by a +24V slow turn on power regulator that takes approximately 20 seconds to reach full voltage. This design improves the overall operation of your lunchbox PSU and makes the unit independent from the other modules in the lunchbox. To achieve the classic feel of the original 1073, the unit is constructed with Marconi-style knobs and vintage engraved pushbuttons.

UPC: 639713908244
In the Box
Heritage Audio '73 Junior API 500 Series Microphone Preamplifier Module
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Heritage Audio 73 JR specs

    Input Impedance Microphone
    HI: 1200 Ω minimum
    LO: 300 Ω minimum

    Line: 10 kΩ bridging, Carnhill transformer balanced and floating
    DI: Greater than 2 MΩ, unbalanced
    Output Impedance Less than 75 Ω,
    Transformer balanced and floating to drive a load of 600 Ω
    Maximum Output Greater than +26 dBm into 600 Ω
    THD Less than 0.025% at 1,000 Hz
    Less than 0.05% at 100 Hz
    Frequency Response 20 Hz (+0.3 dB) to 20,000 Hz (-0.2 dB)
    Maximum Gain Slightly greater than 80 dB
    Noise Less than -100 dBm
    Power Consumption 88 mA per rail at ±16 VDC
    Dimensions (W x D x H) 1.50 x 6.89 x 5.32" (3.81 x 17.5 x 13.5 cm)
    Weight 1.3 lb (0.6 kg)
    Packaging Info
    Package Weight 2.85 lb
    Box Dimensions (LxWxH) 10.5 x 8.3 x 4.1"

    Heritage Audio 73 JR reviews

    '73 Junior API 500 Series Microphone Preamplifier Module is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from HA73 & Sony C37a Great build. Fantastic sound. (and speedy free delivery from B&H). I've been using the HA73jr primarily on bass, snare, male vocals and piano. It delivers on all fronts. My lead vocal chain has been a Sony C37A thru a UA6176... which has been on the warm/dark side in a good way, and easy to place in the mix. I'm now experimenting with the HA73 running into the 1176 side of the UA. In comparison, it has a more forward, punchier sound with a bit of harmonic lather that I find very satisfying. It is a bigger, more present sound. On bass, we've been using a Reddi DI into a 1975 Soundcraft Series II pre. The HA has more harmonic content, again, bigger, more dimension. Totally happy. When driven hard, the distortion is tasty and useful. I mic'd the piano with the C37a and drove the HA73 hard, with surprisingly musical results. Overdriven and guitar like, but certainly usable in the right creative context. The quality is solid, the look is beautiful. Nothing bad to say so far. Hifi for sure.
    Date published: 2015-02-25
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