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McIntosh C28 Vintage Analog Preamp with Phono - Serviced

Sale price$0.00
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Pickup currently unavailable at SkyFi 479

Mcintosh C28 Vintage Analog Preamp With Phono - Serviced Preamplifier

McIntosh C28 Vintage Analog Preamp with Phono - Serviced

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


This gorgeous preamp was serviced in house and is now working as it should throughout.

It features the classic McIntosh vintage look and feel including a backlit glass faceplate, large polished knobs, and satisfying pushbuttons with LED's.

Controls are just what you need, input selector, volume, balance, and tone controls. The individual left and right tone controls are a nice plus.  

Cosmetically it presents very nicely. The glass faceplate is clean and the paintwork is without any deep scratches, rust, or wear.

The C28 is a crowd favorite from this era.  It's easy to service, has a low noise floor, great vintage looks, and every feature we would want. 

We have a matching and perfectly fitting wood cabinet available for this unit, just drop us a note if you'd like to add to your order.

McIntosh Standout Features:

• 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

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - Phono Interconnects - Better

Kimber Kable - Flagship Phono Interconnects - Best

The SkyFi Testing Process for Preamplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCB’s for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

When we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface. The first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope. We then switch to a 1KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment. Once the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources. If the preamp is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve. If the preamp under test has balanced inputs and/or outputs these are tested as well.

We finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected. If the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.



Original Box

Yes Included


Yes Included


Not Applicable


Yes - Power Only

Physical Condition (Info Here)

7 / 10

Working Condition

10 / 10

SKU: 104367