McIntosh C20 Vintage Tube Preamp with Custom Case and Full Telefunken Tube Complement


By far the mintiest C20 we've ever seen in our shop.

The metalwork is simply gorgeous while the faceplate, knobs, and indicators look crisp and clean.

The case is a custom high quality affair with a gorgeous patina and perfectly routed metal vent. This case is a higher quality furniture grade, unlike the particle board and lightly veneered affair that was originally produced.

Internally this C20 was well cared for and will receive a light service from us just prior to shipping to ensure a perfect client experience.

We've save the best for last... we've also installed a full complement of vintage Telefunken tubes that will make this preamp sing!

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - Phono Interconnects

Click below for a copy of the owner's manual:

McIntosh C20 Stereo Preamplifier Owner's Manual

The SkyFi Testing Process for Preamplifiers:
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.



Original Box





Not Applicable


Yes - Power

Physical Condition


Working Condition


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