The McIntosh C31V is a vacuum tube preamplifier that features a classic design and high-quality audio performance. It includes multiple inputs and outputs, allowing for flexible connectivity with various audio sources. The C31V is known for its ability to enhance sound clarity and detail, making it a popular choice among audio enthusiasts. Additionally, it often incorporates features such as tone controls, a remote control, and well-regarded build quality, with a focus on both aesthetics and functionality.