I misunderstood your question. (the hazards of 2 am postings).
In my experience and the experience of a few friends the ic between source and pre is always far more influential (critical?) than the ic from pre to amp.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.