Jon, it seems you could pin the problem down for both SR and Ayre by getting all four versions of the ,25A Littlefield fuses for next to nothing and see what blows and what doesn't. If none blow, then SR probably has anot issue.. If some do and some don't then SR and/or Ayre would know how to be more specific about their products.
Since you're without fault, someone owes you restitution, and the tests would help make your case and assign probable cause.
As for the SR Black, my results were so obvious that I've ordered one for an old Classe CA-300 that I'm giving to my new-son-in-law just to give him a better product even though he's no audiophile. Curious that we've seen so few theories on what is happening electrically.
Since you're without fault, someone owes you restitution, and the tests would help make your case and assign probable cause.
As for the SR Black, my results were so obvious that I've ordered one for an old Classe CA-300 that I'm giving to my new-son-in-law just to give him a better product even though he's no audiophile. Curious that we've seen so few theories on what is happening electrically.