Sorry, I have not heard the Audiomeca Mephisto so I cannot know if that is the issue.
I assume youve tried various feet under the Audiomeca, such as the Symposium Roller blocks? The source end of the system, particularly the CD player and preamp have a great deal of affect on what comes out of the amp.
As for power cords, the Purist is more detailed than the Elrod and less compressed. The price for a pair of input tubes and a set of Roller Blocks is less than the Elrod or Purist. I would consider the less expensive auditions, working my way up as necessary to reach your goal.
I assume youve tried various feet under the Audiomeca, such as the Symposium Roller blocks? The source end of the system, particularly the CD player and preamp have a great deal of affect on what comes out of the amp.
As for power cords, the Purist is more detailed than the Elrod and less compressed. The price for a pair of input tubes and a set of Roller Blocks is less than the Elrod or Purist. I would consider the less expensive auditions, working my way up as necessary to reach your goal.