@buellrider97 Thanks Mike. I did a very long post a few years ago on building my system. (link on my virtual system) Creeping up on 10,000 views, and garnered some very nice comments. I'm going to do another words & pictures post on the construction of my new listening room, that was part of a basement development.
On the buzz issue, I'm a bit embarrassed to say I think it has been resolved. This morning I took another run at it, just to be sure I had covered every base. The last thing was to reverse the XLR cables at the preamp to see if the problem was cable specific. Buzz gone. Put the cables back in their right place and the buzz is still gone. So, the culprit seems to be a slightly loose connection with one XLR cable? When all else has been eliminated, the remaining solution is correct regardless of how unlikely? Or something like that. Anyways, thanks again to everyone who pitched in. Your repeated suggestion to check the connections made me go back to that. Cheers.