You can see the specs for the C220 on McIntosh's site plus I haven't heard this unit.
I have heard the C2200 and C2300 though and bought the C2300. The C2300 is an update to the C2200 and uses a R-core transfomer which produces less noise and hum. It also has some other upgraded parts inside. I preferred the sound of the C2300 with my SS amp and bought it used with 300 hours on it. Nice preamp although I did tube roll the Chinese made stock line stage tube pair.
I have heard the C2200 and C2300 though and bought the C2300. The C2300 is an update to the C2200 and uses a R-core transfomer which produces less noise and hum. It also has some other upgraded parts inside. I preferred the sound of the C2300 with my SS amp and bought it used with 300 hours on it. Nice preamp although I did tube roll the Chinese made stock line stage tube pair.