ha, no problem.. just my rule, for whatever that's worth... great place to start (and end up) for me.
I have a McIntosh amp... which I can't hear much difference swapping PC's on it... In my system, the pre is the truth-teller... simple tube circuit (Belles 21a)
I'll try again though.. you never know! It's been a long time since I compared PC's.
-C