Mcintosh C28 Preamplifier - Fully Restored And Near MINT

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This preamp was fully restored in-house and is working perfectly. 

Cosmetically it's close to perfect - the glass is perfect, the end caps are smooth and clean, and the paintwork is super nice.  It will be hard to find another in better condition. 

The C28 is the best preamp from this era in our opinion.  It's easy to service, has a low noise floor, great vintage looks, and every feature we would want.  The individual left and right tone controls are a nice plus.  

Standout Features Include:
• Use 3 Tape Machines
2 with their own electronics and 1 tape playback deck with complete easy front panel switching
• Built-In Headphone Amplifier
Listen to your favorite music --- privately
• Main and Remote Loudspeaker Switching
Turn the main speakers on or off without affecting the remote speakers and vice versa (operates with accessory relay)
• New Low Noise Phono Input
Listen to your records with a new quietness
• Individual Channel Phono Level Controls
Match levels from different phono cartridges without degrading signal to noise ratio
• Individual Channel Output Level Controls
Perfect balance from your stereo always
• Individual Channel Tone Control Switches
Complete, repeatable flexibility
• New Compensation Control
One position for loudness compensation, one position is flat and a third position that adds presence compensation!

Please see the following PDF's for full technical specifications:

Click here for a PDF copy of the McIntosh C28 Sales Brochure

Click here for a PDF copy of the McIntosh C28 Owner's Manual

Click here for a PDF copy of the McIntosh C28 "If You're in a Hurry" Guide

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.