Heritage Audio 8173 Microphone Preamplifier Module

SKU: HA8173 MFR: HA8173
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Key Features

  • Capture pristine audio with the 8173 microphone preamplifier's ultra-low noise floor.
  • Achieve versatile sound shaping with selectable EQ frequencies on this channel strip.
  • Experience vintage tone with the classic inductor-based EQ of this preamp module.
  • Optimize gain staging with an impressive 80dB+ maximum gain for any microphone.
  • Ensure sonic clarity with a wide 20Hz-20kHz frequency response for detailed recordings.
  • Selectable input impedance allows you to perfectly match your ribbon microphones.
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Heritage Audio Mic Preamplifier Module Specifications

  • Frequency

    High: +/-16dB selectable frequency shelving at 10, 12 or 16 kHz, Baxandall type
    Low: +/-16dB with selectable frequency shelving of 35Hz, 60Hz, 110Hz & 220Hz ,Baxandall type
    1081 Upper Mid: +/-18dB peaking, fixed 'Q' , selectable center frequencies of 1.5Khz, 1.8kHz, 2.2Khz, 2.7kHz, 3.3Khz, 3.9kHz, 4.7kHz, 5.6kHz , 6.8kHz and 8.2Khz , inductor based

  • Frequency (cont.)

    1081 Lower Mid: +/-18dB peaking, fixed 'Q', selectable center frequencies of 220Hz, 270Hz, 330Hz, 390Hz, 470Hz, 560Hz, 680Hz, 820Hz, 1000Hz and 1200Hz, , inductor based

  • 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

    10KOhms bridging, transformer balanced and floating

  • Output impedance

    Less than 75 Ohms, transformer balanced and floating, to drive a load of 600 Ohms

  • Maximum output

    Greater than +26dBm into 600 Ohms, greater than +32dBu into 10KOhms

  • THD

    Less than 0.025% at 1Khz, 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

    110 mA at 24VDC

  • Dimensions (W x D x H)

    1.77 x 12.2 x 8.74" / 44.96 x 309.88 x 222.00mm

  • Weight

    5.1lbs / 2.31kg

  • UPC Code

    639713908220

About Heritage Audio Mic Preamplifier Module

Over the years, Heritage Audio has been a trusted name in the audio industry, known for their high-quality, professional, and reliable audio equipment. The 8173 Microphone Preamplifier Module is no exception. This innovative and versatile module is a testament to their commitment to superior sound and durability.

In 1972, the 1081 emerged as the most flexible equalizer ever incorporated into a mixing console. Its unique 4-band equalizer allowed for unprecedented sound sculpting, largely due to its mid bands covering almost the entire audio spectrum in 20 steps. However, its class A/B output stage was a step down from the class A used in the 1073, making the latter a preferred choice for tracking.

For two decades, audio professionals have pondered the possibility of a 1081 equalizer with a 1073 preamp in their console. The answer was always a resounding 'no' until the introduction of the 8173 Microphone Preamplifier Module. This module combines the best of both worlds in an 8 3/4" package, fully compatible with Series 80 consoles.

The 8173 can be aptly described as a 1073 preamp with the mid bands of the 1081. Heritage Audio has wisely retained the 1073 Baxandall shelving low and high equalizer bands due to their exceptional sound quality. However, they have added a choice of 3 high shelving frequencies, reminiscent of the 1084. This combination of features provides unparalleled flexibility and tone, making the 8173 Microphone Preamplifier Module a standout choice for any professional audio setup.

Heritage Audio Mic Preamplifier Module 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
  • 10dB Class A Line Amplifier, Bridging input impedance, balanced and floating
  • Class A, single ended, 2N3055 driven high headroom output stage
  • High Pass Filter - 18dB per octave slope, switchable between 50Hz, 80Hz & 300Hz, inductor based. (Although push button switches has been used instead of the classic rotary switch, the circuit is the same exact one found in vintage 1073s, sacrificing only one frequency choice for space issues)
  • EQ Button - Switches the equalizer on or off
  • Phase Button - Flips phase180 deg.
  • 8173 Module available. 19" Convertible Series available Spring 2012

Product Documents

User Manual

Key Features

  • Capture pristine audio with the 8173 microphone preamplifier's ultra-low noise floor.
  • Achieve versatile sound shaping with selectable EQ frequencies on this channel strip.
  • Experience vintage tone with the classic inductor-based EQ of this preamp module.
  • Optimize gain staging with an impressive 80dB+ maximum gain for any microphone.
  • Ensure sonic clarity with a wide 20Hz-20kHz frequency response for detailed recordings.
  • Selectable input impedance allows you to perfectly match your ribbon microphones.

What's in the box:

  • Heritage Audio 8173 Microphone Preamplifier Module
  • Heritage Audio 1 Year Parts & Labor Warranty