This is the venerable Great River MP-2NV two-channel mic preamp in near-mint condition. There's hardly any sign of use. Dan Kennedy, owner of Great River, has retired, so there won't be any more of these units coming on the market. The ones that come up in the used market tend to be used hard. This one, in near-mint condition, will last you a lifetime.

There's some info below from their website. If you're looking at this you already know what it is and how amazing these units are. See my feedback rating and buy with confidence.

MP-2NV: TWO-CHANNEL MIC PREAMP
MSRP: $2,960

Classic 70s Vintage British Circuit Styling

The MP-2NV (two channel mic preamp) greatly modernizes and improves classic British design. This single-rack-space pair of preamps offer the same definitive sonic fidelity and expert craftsmanship as all Great River products. Transparency and vintage harmonic structure are both achieved with NV-Series preamps.

The MP-2NV achieves “new classic” performance status with two discrete Class-A gain stages (the dual gain-stage meters are a Great River exclusive), a front-panel DI input jack which is routed via a FET and BJT buffer through the input transformer (also unique to Great River preamps) for must-hear-to-believe sound from all hi-Z instruments, and a discrete high-current Class-A "big iron" transformer-coupled output amplifier. The MP-2NV is a fundamentally important audio tool that brings out the best in every microphone and instrument.

The MP-2NV has an internal power supply suitable for operation on any power grid. A simple change of fuse and proper positioning of a voltage selector will adjust the unit for any voltage between 100 and 240 V AC.

The NV Series’ construction quality is “like a beautiful battleship”, said one grizzled audio veteran.

MP-2NV: TWO-CHANNEL MIC PREAMP
MSRP: $2,960

Classic 70s Vintage British Circuit Styling

The MP-2NV (two channel mic preamp) greatly modernizes and improves classic British design. This single-rack-space pair of preamps offer the same definitive sonic fidelity and expert craftsmanship as all Great River products. Transparency and vintage harmonic structure are both achieved with NV-Series preamps.

The MP-2NV achieves “new classic” performance status with two discrete Class-A gain stages (the dual gain-stage meters are a Great River exclusive), a front-panel DI input jack which is routed via a FET and BJT buffer through the input transformer (also unique to Great River preamps) for must-hear-to-believe sound from all hi-Z instruments, and a discrete high-current Class-A "big iron" transformer-coupled output amplifier. The MP-2NV is a fundamentally important audio tool that brings out the best in every microphone and instrument.

The MP-2NV has an internal power supply suitable for operation on any power grid. A simple change of fuse and proper positioning of a voltage selector will adjust the unit for any voltage between 100 and 240 V AC.

The NV Series’ construction quality is “like a beautiful battleship”, said one grizzled audio veteran.

BENEFITS

• 'Big Iron Vintage Sound' from custom-wound transformers
• 'No-latency' output monitoring for DAW users
• High-Z input is ideal for bass, guitar, and sound modules (FET-buffered and routed into the input transformer, a Great River exclusive)
• Gain stage monitoring via dual meters (also a Great River exclusive)
• Ultra quiet noise floor for outstanding performance at any gain setting
• Excellent stereo imaging (nearly identical phase response channel-to-channel)