Heritage Audio DMA73
Includes a 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. The 50Db Class A Line preamplifier,with bridging input impedance, and is set up as balanced and floating.They are 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. with a Class A single ended, 2N3055 driven, high headroom output stage. Individual Neutrik gold plated XLR connectors support the hardware of the microphone and its line inputs. Also includes Gold Plated Neutrik XLR output. The unit has ar PAD: 20dB Mic input attenuation ahead of the input transformer to avoid overloading it. This unit has an additional feature of a HI PASS FILTER: Active all discrete Class A 3rd order Bessel, 80Hz Hi Pass Filter. 18dB/octave slope. The outlet control is allowed overload4 of the preamp.External linear PSU to avoid electromagnetic radiation into the audio transformers ( a.k.a. hum ). It built tought with Carnhill Input and Output transformers, as well as a 3 gain stage, genuine B283 gain card modular construction. Surface has Marconi style knobs and vintage style engraved pushbuttons. These new classes are great replicas of the same thing, and sounds terrific every time.
Heritage Audio DMA73
Includes a 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. The 50Db Class A Line preamplifier,with bridging input impedance, and is set up as balanced and floating.They are 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. with a Class A single ended, 2N3055 driven, high headroom output stage. Individual Neutrik gold plated XLR connectors support the hardware of the microphone and its line inputs. Also includes Gold Plated Neutrik XLR output. The unit has ar PAD: 20dB Mic input attenuation ahead of the input transformer to avoid overloading it. This unit has an additional feature of a HI PASS FILTER: Active all discrete Class A 3rd order Bessel, 80Hz Hi Pass Filter. 18dB/octave slope. The outlet control is allowed overload4 of the preamp.External linear PSU to avoid electromagnetic radiation into the audio transformers ( a.k.a. hum ). It built tought with Carnhill Input and Output transformers, as well as a 3 gain stage, genuine B283 gain card modular construction. Surface has Marconi style knobs and vintage style engraved pushbuttons. These new classes are great replicas of the same thing, and sounds terrific every time.
Features
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• 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
