A new pair of Shuguang WE-845's.. These are essentially a 'United' copy of the 845 with the internal nipple at the top of the tube to help stabilize the plate. They sound awesome and are rock solid. I have burned them in for roughly 30hrs. and have observed no drift in bias. Compared to standard 845B's they are in another class. I had originally bought these direct from China as they are not available in the US anywhere. I am only selling because I have decided to part with my LM-518 and go a different route. Of the few people that have listened to these tubes compared to the Psvane WE845's, they have been preferred over the Psvane's which have a lot great feedback... They have a 1 year warrenty from the factory and if needed I will gladly help facilitate getting them back to the factory for replacement.