Item #1571270 Model #HA81A

Heritage Audio 81A Microphone Preamp & EQ Standard


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Versatile synth combining inspiration from two classic circuits.

The Heritage Audio HA-81A is a mix of two classic console circuits. The HA-81A Elite is a channel strip that combines an all discrete, Class-A 73-style mic preamp with an extremely versatile and musical console-style equalizer, arguably the trick for obtaining instant classic sound for all recording engineers. The HA-81A’s preamp section is an 80 dB, all discrete Class-A design with Carnhill/St. Ives input and output transformers, exactly the same one found in the other Elite Series modules. The preamp features gain, output trim, -20db pad, polarity reverse, and +48v phantom power. The HA-81’s equalizer section is an exceptionally musical 4-band, inductor-based equalizer with high and low pass filters. Where 3-band equalizers exceed at musicality but may be short on features, the HA-81A EQ equally excels at both. Extreme control over Shelf or Bell response curves on the high and lows, dual Q on both mid-bands, with dedicated high and low mid ones and a range of 40 frequency selections to choose from. The Heritage HA-81A utilizes only rotary switches and precision, concentric potentiometers.
  • Line input impedance: 10K Ohms 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 +26.5dBu into 600 Ohms (internally terminated)
  • 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
  • Equivalent Input Noise: Less than -125dBu at 80dB mic gain
  • Output stage noise: Less than -100dBu
  • Power consumption: Less than 150 mA @48VDC


  • Mic pad push button
  • Input gain switch
  • Phantom power switch
  • High mid peak band
  • Low mid peak band
  • Output attenuator