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Heritage Audio 8173- 8173 Mic Preamp and 4 band EQ

£2,395.00 inc. vat
£1,995.83 ex. vat
Please contact us for availability.

Heritage Audio 8173- 8173 Mic Preamp and 4 band EQ

The Heritage Audio 8173 is a mic pre and four bad Equaliser designed for the 80 series formfactor. The 8173 could be described as a 1073, with the mid bands of the 1081. The pre-amp has 80dB available gain in 5dB steps. The unit includes a comprehensive EQ with High shelf, Hi mid peak band, Lo mid peak band and a Low shelf as well as a Hi pass filter. 

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.


  • 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 +26dBu into 600 Ohms, 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 -100dBu.
  • Power consumption: Less than 110 mA @24VDC.