If you like the compact preamps, I’d recommend the C710/C712 (C712 has a remote) instead, quieter and better specs overall, You only get one phono-in (has CD in added instead) but IMO a much MUCH better piece of equipment.
Some tend to post the suggestions to get them at the right price so you can get your money back, I say get the right one and skip the hassle of trying to sell. I hate selling stuff (but love buying!!), it is a lot of added hassle.
As others have said before, newer is almost always better. The C26 and C28 are great preamps for their time (I had both), but technology has changed a lot and McIntosh’s newer generation amps are more reliable / less maintenance, they are much lower distortion, lower noise / better S/N, remote-control, remote-power, electronic switching, sealed pots, eventually LED backlight, etc., etc.
Personally I’ve never bought into the built-in tone controls (the five-band EQ) as it isn’t enough to correct pretty much anything much better than just bass and treble controls, if you want an EQ buy an EQ or better still a DSP that can do it all, having a few fiddly knobs are not enough to do the job right.