A few months ago, I started buying up some oddball/alternate tubes on eBay, tubes that work well in the Lyr but don't seem to get into the mainstream discussion here. Many of them are built in the same Blackburn, Herleen and Munich factories, with the same materials, as the super expensive glass that gets all of the press, but at much lower prices. I have found some stuff that sounds every bit as good as the expensive glass I own, along with others that while not in that absolute top tier, still sound very good to excellent. I've got a box of mid 60s through 1970 Bugle Boys and OGs now that I need to go through as well, probably 20-25 pairs of those. That led to buying a Maxi Preamp tube tester/matcher, and now I'm sitting on an inventory of over 750 tubes, finally getting close to start selling some of them.