Up for sale, I bought Albert Porters Dali Megaline speakers a while back, and have since sold them. I still have a huge amount of tubes that he also sold to me. If you have a tubed crossover it might be worth it for you to check these out. If interested let me know. I have several of every tube needed to make the crossover work. I want to sell all tubes at once, Albert told me these would last me the rest of my life and that was for his dual crossover. If interested please contact me. Albert said there retail price was about $1,600. I will pay for PayPal costs and have a flat fee of $50, if it is cheaper than that to ship I will decrease the amount. Thanks for looking.