The ART Tube MP Professional Mic Preamp/Processor is a 12AX7-based mic preamp that provides high-quality sound and smooth response. You get 70dB of gain while maintaining a low noise floor suitable for digital. Features 1/4" balanced and XLR balanced inputs, 1/4" TRS and XLR balanced outputs, input and output level controls, a phantom power switch, "soft" power up and down, and more.