OK, here is what I suggest. While it applies generally, it is particularly true f rthe tubes you reference. Buy only from a relaible dealer of tubes whom you know trust and/or who will trust you to return them if needed. These can be just fabulous sounding tubes from my experience but can be microphonic to an extreme. I had a couple the sounded fantastic in Kora Eclipse that I had, but I had another pair that looked identical but rather sucked. At the price thse command, you want to be sure you can return them.
