After reading this, I felt I would add to this. I have just received in the last week, the x-719's. Not from Bill, but another audiogoner. I have just purchased the Jolida 1501rc from Bill. I am currently breaking them in on an Onkyo Sr601 85watt receiver. I can say that over the week so far, the speakers have really opened up to a so so receiver. Now when I get the Jolida hooked up I will post my thoughts. I know this was about tubes, but I thought being about a hybrid would help fellow music lovers.