Well, Gene, if you did the lab testing for every amp and preamp out there, we would NOT have to use any other sources!
Unfortunately, you don't get to review every product out there.
For example, Denon still has not sent you the Denon 5308.
And you did not review the Onkyo 805, Denon 4308, Yamaha 1800, etc. Thus, we are forced to look to other sources.