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Heritage Audio DMA-73 Microphone Preamp

 
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Description

If one Neve preamp is what you crave, well then, in that case...TWO are better than one! Introducing the Heritage Audio 2-channel DMA-73 Microphone Preamp

The Heritage Audio DMA-73 2-channel Microphone Preamp effectively takes on the challenge of reproducing that classic Neve 1073 sound. It features two independent microphone, line and instrumental (DI) inputs channels designed with exacting detail to accurately reproduce the tonal characteristics of the 1073. Both channels have Gain and Output regulators, 20dB gain reduction, an 80Hz high-pass filter, Phantom power and polarity switches. Both the Input and Output transformers utilize the well-regarded balanced and floating Carnhill transformers.

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
  • 50dB Class-A Line preamplifier, bridging input impedance, balanced and floating
  • All discrete Class-A Ultra-High Impedance J-Fet Direct Input on a high quality Neutrik Jack. The DI circuit is ahead of the Mic Input transformer, so the transformer is on when in DI mode
  • Class-A single ended, 2N3055 driven, high headroom output stage
  • Individual Neutrik gold plated XLR connectors for microphone and line inputs.
  • Gold Plated Neutrik XLR output.
  • PAD: 20dB Mic input attenuation ahead of the input transformer to avoid overloading it.
  • Hi-PASS FILTER: Active all discrete Class A 3rd order Bessel, 80Hz Hi-Pass Filter. 18dB/octave slope.
  • OUTPUT control to allow overloading of the preamp.
  • External linear PSU to avoid electromagnetic radiation into the audio transformers ( a.k.a. hum ).
  • Carnhill Input and Output transformers.
  • 3-gain stage, genuine B283 gain card modular construction.
  • Marconi style knobs and vintage style engraved pushbuttons.

Specs:
  • 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 Carnhill transformer balanced and floating.
  • Line input impedance: 10K Ohms bridging, Carnhill transformer balanced and floating.
  • DI input impedance: Greater than 2 Megohms, unbalanced.
  • Output impedance: Less than 75 Ohms, Carnhill transformer balanced and floating, to drive a load of 600 ohms (factory terminated).
  • Maximum output: Greater than +26dBm into 600 ohms.
  • THD: Less than 0.025% at 1 Khz, 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: Less than 200mA @24VDC



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