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Heritage Audio 6673, 8173 & Rack 2

Heritage Audio 6673, 8173 & Rack 2

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Heritage Audio 6673, 8173 & Rack 2

This bundle comprises the Heritage Audio 6673 and 8173 Mic preamps and EQ modules and a Heritage Audio Rack 2 PSU


Heritage Audio is proud to introduce the 6673 module. A 100% series 80 compatible module featuring the same Class A mic preamplifier found in the classic modules with an added key feature: A 4 BAND EQUALIZER. Better said, THE 4 band equalizer as it features the same exact 3 band equalizer circuit found in the famous 1073 plus the mid band found in the 1066.
In addition, we have expanded the 1073 mid band with 3 extra frequency choices, widening the sonic palette.


Now you can boost at 700 Hz for "thick as a brick" guitars and cut at 360 Hz to get rid of the mud.



  • 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 Frequency: +/-16dB selectable frequency shelving at 10, 12 or 16 kHz, Baxandall type.

  • Low Frequency: +/-16dB with selectable frequency shelving of 35Hz, 60Hz, 110Hz & 220Hz ,Baxandall type.

  • 1073 Mid Frequency: +/-18dB peaking, fixed 'Q' , selectable center frequencies of 0.24 Khz, 0.36kHz, 0.53Khz, 0.7kHz, 1.1Khz, 1.6kHz, 3.2kHz, 4.8kHz , 7.2kHz and 10Khz , dual inductor based.

  • 1066 Constant Q Mid Frequency: +/-18dB peaking, fixed ´Q´, selectable center frequencies of 0.7 Khz, 1.2 Khz, 2.4Khz, 3.6Khz, 7.0Khz, inductor based.

  • 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. Real state is tight on these modules).

  • EQ Button: Switches the equalizer on or off.

  • Phase Button: Flips phase 180º.



We are proud to introduce the 8173 mic pre- 4 band equalizer module. The name says it all. The best of both worlds in an 8 3/4" module package, fully compatible with Series 80 consoles. It could be easily described as a 1073 with the mid bands of the 1081. We´ve decided to keep the 1073 Baxandall shelving lo and hi eq bands as they sound amazing, but have implemented a choice of 3 hi shelving frecuencies, a la 1084. Flexibility and Tone!!!



  • 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 Frequency: +/-16dB selectable frequency shelving at 10, 12 or 16 kHz, Baxandall type.

  • Low Frequency: +/-16dB with selectable frequency shelving of 35Hz, 60Hz, 110Hz & 220Hz ,Baxandall type.

  • 1081 Upper Mid Frequency: +/-18dB peaking, fixed 'Q' , selectable centre 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.

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

  • 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 .Real state is tight inside these modules).

  • EQ Button: Switches the equalizer on or off.

  • Phase Button: Flips phase180º.



The Heritage Audio Rack 2 is handmade in the EU employing the same exact ISEP mechanical components used in the Series 80 consoles. Aluminium rails, guides, etc. This will ensure your vintage modules, as well as any of the currently made, will fit like a glove.

Short Description Includes the 6673 and 8173 Mic Preamp and EQ modules and Rack 2 Chassis
Demo in Store N/A
Manufacturer Heritage Audio
Old Price N/A

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Ex. VAT: £3,790.83 Inc. VAT: £4,549.00

Price as configured: Inc. VAT: £3,790.83 Ex. VAT: £3,790.83

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