McIntosh C31V Preamp with Phono - Includes Remote, Wood Case, and Manual


Please check out our full video review on our YouTube channel:The included wood case has a few light scratches, but the preamp is near perfect otherwise. We would rate the wood case a 7 and the unit itself an 8.

Please see our photos for specifications and standout features.

Click here for a PDF copy of the McIntosh C31V Owner's Manual

Our Testing Process for Preamplifiers (All) at SkyFi:

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. Special attention is paid to the power supply which is the most common source of failure for preamps. We then power up the unit and run a simple 1k sine wave while monitoring the low voltage output on an oscilloscope for signs of distortion or noise to get a baseline.

At this point we will lubricate and clean all switches and potentiometers (that are not sealed) with a high quality contact cleaner, and then re-test all functions for any signs of noise or scratching.

Final testing involves putting actual music through the preamplifier We have learned over time that some issues are only noticeable to a trained ear while listening to a familiar source material. Our test bench has reference vintage KEF speakers that we are super familiar with which will quickly reveal any discrepancies. Some preamps will then move into the listening room where they will be tested with our in-house reference system.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.



Original Box



Yes & Online




Yes - Power

Physical Condition - Unit

Physical Condition - Wood Case



Working Condition


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