Thanks for the link!
I have a few of those issues and really enjoyed the articles. Really learned a lot when they highlighted a particular tube type.
It's funny, I seem to recall in one of the issues on 6DJ8/6922 that they said something about what a great investment the Amperexes would be. I passed up some 8 packs for something like $120 a pack!
Now that I think about it,.. it isn't so funny!