The Heritage Audio DMA73 2-Channel microphone preamp combines outstanding Class A preamp design and premium componentry to provide you pristine audio details and sonic flexibility.
Perfect for old ribbon mics, the 80dB microphone preamp lets you faithfully re-create that vintage sound. The Heritage Audio DMA73 also features ultra-high-impedance J-Fet direct input and 20dB pad, so you'll have clarity in your signal chain without the fear of overloading. Armed with Neutrik input and output jacks, the Heritage Audio DMA73 2-channel microphone preamplifier is a front-end like no other.
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.
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)