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Heritage Audio 8173 80-Series Equalizer

Model: HA8173

Heritage Audio 8173 80-Series Equalizer
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About: Heritage Audio 8173 80-Series Equalizer

The 8173 module is a Heritage Audio´s new design, which has been engineered to fill input module slots in the restoration process of vintage 80 Series sound mixing consoles. It is also compatible with the Heritage Audio Frame 8 and Rack 2 powered enclosures.

The 8173 could be easily described as a 1073 with the mid bands of a 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 frequencies, a la 1084.

Special care has been taken in sourcing the correct components that ensure performance will be as close to a 1070s unit as it is possible nowadays. Custom polystyrene and film tone capacitors have been developed to closely match the Siemens Styroflex and Mullard Mustard types of the late 60s and early 70s. Custom input transformers have also been co designed with Carnhill Transformers´ Oxford factory to our special requirements.

The Heritage Audio 8173 is entirely handmade in our facilities in Spain, employing the same old-fashioned wiring and soldering techniques of the 70s. All its circuitry is held into five plug in cards.

Specifications:

  • 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.
  • 8173 Module available. 19" Convertible Series available Spring 2012.
  • 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 @24VDC.

UPC: 639713908220

Reviews: Heritage Audio 8173 80-Series Equalizer

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Warranty: Heritage Audio 8173 80-Series Equalizer

AVShop.ca Warranty:

30 Days

Manufacturer's Warranty:

Three Years, parts and labour against manufacturer defects.