Applied Research & Technology's Tube MP Studio ($159) is a redesigned version of its original Tube MP mic preamp. The Tube MP Studio adds a VU meter for visual feedback on the output level and has a brickwall peak limiter. The VU meter reflects the limiter's effect on the signal; for example, if the signal is in the red on the VU meter, engaging the limiter will bring the signal out of the red. A.R.T. claims the Tube MP Studio will provide more than 70 dB of gain.
You can also use the unit as a DI box for line-level signals. It uses a 12AX7 tube and offers variable input- and output-gain knobs. The preamp has a phase-reverse switch and provides defeatable 48V phantom power via the XLR input. Inputs and outputs are on both unbalanced 11/44-inch and balanced XLR jacks.