Heritage Audio DMA-73, • 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.,