The "charactor" of pure Class A?

I have a pair of Clayton M300 in my set up for the next couple of months. Very nice.

I have to admit these are the first Class A amps I have spent any significant amount of time listening to and I am impressed.

My questions is, do Class A amps have a sonic signature of their own?

I like what I am listening to very much, but would like to be able to discern what might be a base class A sound against what Clatyon itself may bring to the sonic whole...

Comments?