Heritage Audio DMA73 Dual Microphone Amplifier. 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.OUTPUT control to allow overloading of the preamp. External linear PSU to avoid electromagnetic radiation into the audio transformers a. 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). Maximum gain: Slightly greater than 80dB. Merchandise and packaging MUST be in the same condition as when received. Alto Music reserves the right to refuse any return if it appears the item has been used. Software (if unsealed or registered). Harmonicas, Mouthpieces, Earbuds/Earphones/Headphones(if unsealed), or any item that may come in contact with the mouth, ears or nose. There are no warranties for the following items. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "altomusic" and is located in this country: US. This item can be shipped to United States.