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The DVA is a hybrid microphone preamplifier based on the Hazelrigg Industries VLC and D.W. Fearn VT-1 preamp. Utilizing a single 6072a vacuum tube, the input circuitry matches the VLC/VT-1 input stage exactly and features transformers in both the input and output stages. Make-up gain is provided by a low-THD/high[1]output solid state signal path (as opposed to the vacuum tube circuits in the VLC/VT-1) due to the module size and power supply limitations inherent in the 500 series format. Total gain available is approximately 60db.
