The inputs are designed to provide the proper load impedance for all instruments that have a 1/4-inch phone jack output. Tube circuitry provides the very high impedance necessary to capture all the details of these instruments.

The outputs of the VT-3 are mic level (150 ohm source impedance at a nominal -30dBV). The VT-3 is designed to operate into a high-quality microphone preamplifier like our VT-1 and VT-2 Vacuum Tube Microphone Preamplifiers

Operation is very simple: plug the instrument into the 1/4" front panel jack and take the output either from the front panel XLR connector, or a parallel XLR connector on the back panel. A second 1/4" jack provides an output to feed a guitar amplifier when necessary. A ground-lift switch helps eliminate ground loop buzz, and a switchable high-pass filter gently rolls off frequencies below 100Hz when required.

The two channels are entirely independent and can be used with two different instruments at the same time.