Our upgraded PVA Preamp is shown here. It has two inputs and two outputs. With the Electra-Print Audio Silver/Nickel PVA transformer the units costs $660. Have a look in the AudioXpress article for an explanation on the PVA circuit. If you don't have the magazine available, we can email you a PDF copy. Please contact us. Options include stepped attenuators and Cardas connectors. This passive preamp features a flat response curve at any attenuator position and works very will with an op-amp driving it.