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Heritage Audio DMA-73 Dual Channel Microphone Preamp

 
  • Dale #:

    HERI-DMA73
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    Not in Stock - Reserve Yours
  • This item is not in stock and needs to be ordered from the manufacturer. Your payment will be charged after completing checkout. We will strive to ship as soon as possible, pending availability.

Description

The DMA-73 brings Heritage Audio's 1073 microphone amplifier designs into a 2U rack mount unit. It's powered by an included linear PSU to decrease hum in the audio path. Features: 80dB Class A Microphone preamplifier, HI-LO selectable minimum input impedance, balanced and floating. H... Read More

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Description

The DMA-73 brings Heritage Audio's 1073 microphone amplifier designs into a 2U rack mount unit. It's powered by an included linear PSU to decrease hum in the audio path.

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.
  • 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.

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Product 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 200 mA @24VDC

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