Matched Pair Psvane UK-6SN7 HIFI series Vacuum Tubes Gold plate pins; UK-6SN7 is mid-u double triode, it can used for voltage amplifier circuit; UK-6SN7 is similar with 6N8P, which can be replaced by each other; If you want matched quad, please contact us. All tubes will be factory matched and tested in original package before shipping. We offer one year guaranty. It will be insured when shipped. Package Included: 2pcs Psvane UK-6SN7 HIFI series Vacuum Tubes with original box Matched pair