Like I mentioned before, I don't doubt your experiences, and yes, the B&K amp probably is less influenced by line distortion. They may also pot their transformers, something that is impractical in the 7700 because of available space.

However, you are doing a real disservice by proclaiming a blanket condemnation of the Outlaw amplifiers for reasons that have more to do with compatibility in your particular case than any flaw of the Outlaw amplifier. As has been noted elsewhere, the vast majority of people have no transformer issues whatsoever with these amps. If it was really a problem, it would manifest it's self with everybody - clearly that is not the case.