Amps or Speakers which one to upgrade next

@inna 

The very basic principle of electronics is that a good design should be independent of individual device parameters. To put it in the language that everyone here will understand -- if tube rolling changes the sound of your gear, then your gear is garbage.   

He knows that he doesn't know or pretends to sound like that. Either is fine with me.

@jond 

Offense taken. Do you think that electrical engineers are imbeciles?