I might disagree with you on the 'matched set' thing, I think it's just a way to separate a man from his money....it's Hogwash! I've never heard a diff in the sound, in fact, I have used several tubes from a competent tube tester that were just fine. Of course they were all the same brand, that makes a diff if your rolling tubes.
Lee, do some searches, there are a lot of favs for those Carys, you really need to study up before spending $1,000 for a retube.