Linlai 300B vacuum tube matched pair, set of 2. I purchased two sets around August 2023 and used them to test the sound. After that, they were stored in their boxes. I have already listed one set, and this is the remaining set. The last four digits of the production numbers are 1525 and 1526. The condition is good, and they function without any problems. Please see the photos. Please understand that this item is a used product, and consider this before purchasing.