This preamp is feature-rich. Check out the details at
http://mcintoshlabs.com/products/mcintosh-c220-vacuum-tube-preamplifier.asp.
This C220 has had some cap upgrades, including some blackgates.. and some were bypassed. I have all the original caps if you wanted to put it back to stock. I don't know why anyone would want to do that, though. It sounds amazing. I would say it's in the league of the 2200 or 2300 but with a touch more warmth. Not many people have direct compared a C220 to 2200 but I have, on a highly resolving system. I've also heard the 2300.
Hearing the bigger brothers is what drove me to do the upgrades on my C220. I wanted more transparency but not at the expense of musicality. It still sounds and works like a Mac overall... just much better sounding than any other C220.
I've got the original box, manual, and remote. It's all yours for $2,700 shipped in the Continental US. This price is firm. You get 2200/2300 sound quality at the price of a good used 220.
