@Evshrug Thank you
.
A friend who had also tested the Ray's said that one tube was noisy.
When I got the set I tried both and it was all good.
Both also ran for several hours on his Cayin amplifier.
So I can't say anything bad here.
Apos Audio sent us two sets and both ran here without any problems.
Regarding availability, Apos Audio is working on finding someone for Europe, unfortunately I don't know any more.
However, it is not easy because of the general European directives and also the dealer is liable in the end.
Give Apos Audio a little more time, they will surely find someone.
However, I can tell you that the tubes are worth it and the customs clearance is worth it.
Importing the tubes into the EU would cost around €30-45 extra, which is still manageable.
You should not think about it.
However, if you do have problems with the tubes, please contact support for help.