Elevate your audio experience with the Riverstone Audio Tested/Matched Pair 7-Pin JAN 5654W Fully-Tested Vacuum Tubes. These fully-tested military-grade vintage vacuum tubes provide an upgrade for 6AK5, 6J1, 6J1P, and EF95 tubes and provide superior performance and longevity. Each tube has been meticulously tested and matched to ensure consistent sound quality and deliver exceptional clarity, warmth, and dynamic range. Our Gold Grade JAN 5654W tested and matched tubes are selected using the same detailed test conditions that Riverstone Audio uses for their premium Platinum Grade 5654W tested/matched pairs. The difference between Riverstone's Platinum Grade and Gold Grade Matched Pairs: (1) to provide 5654W tubes at a lower cost to our customers, the Gold Grade matched pairs are not provided with test data, (2) The warranty period is 2-years for Gold Grade tubes versus 3-years for Platinum Grade, (3) Gold Grade Pairs are matched within 5% for BOTH plate current (iP) and mutual conductance (Gm) verssus 3% for our Platinum Grade Pairs (please note that tube matching within 5% is more than adequate for even demanding audio applications). We GUARANTEE that the 5654W tubes you receive will test at NOS levels and are matached within 5%. PLEASE NOTE: If data for ip and Gm are desired, please visit our Amazon storefront to view our 5654W Platinum Grade tubes which are supplied with measured data labels applied to the tube boxes.