Mcintosh c220 pre question

Has anybody rolled tubes in their c220? If so, what made you swap, what did you swap to and what differences did you notice?

I just got my C220 and even though I've tube rolled in the past, I can't imagine doing it on this baby because it sounds so RIGHT with the factory tubes.

Even the phono stage is just right for me and I'm not shy about tube rolling in phono stages (e.g. EAR 834P).

I bought a Mc c220/mc252 combo because I loved the sound I heard at the store. It was the sound I've been looking for for years. I took them home, got the sound I wanted, and I ain't touching it.