Riverstone Audio - Tested/Matched Pair (2 Tubes) 7-Pin GE JAN 5654W Fully-Tested Vacuum Tubes - Upgrade for 6AK5 / 6J1 / 6J1P / EF95 - GE 5654W Platinum Grade Pair TESTED and MATCHED Pair (2 tubes) of low-noise 7-Pin NIB/NOS GE JAN 5654W Vacuum Tubes. Considered one of the best of the 5654 / 6AK5 / EF95 family of tubes for audio use. These vintage US manufactured GE tubes are Mil. Spec. (JAN) Electron Tubes - Higher Durability and Life. These NOS tubes were obtained from factory-sealed military surplus boxes. BUY WITH CONFIDENCE - Our Platinum Grade vacuum tubes are backed by a no-nonsense 1-year warranty. THE BEST WARRANTY AVAILABLE in the audio tube business. We have been testing and using vacuum tubes for many years and know what it takes to select tubes for low-noise audio applications. **PLEASE NOTE** 5654W tubes CAN ONLY BE USED to replace 7-Pin 6J1, 6J1P / 6J1P-EB / 6Zh1P-EV, 6AK5, 6AK5W or EF95 tubes. DO NOT SUBSTITUTE FOR ANY OTHER TYPE OF 7-pin tube (tube type/code is printed on a tube) -- AMPLIFIER DAMAGE CAN OCCUR IF YOU SUBSTITUTE THE WRONG TYPE OF TUBE -- Before ordering verify the type of tube used in your amplifier and if type 5654W is a suitable replacement. RIVERSTONE AUDIO utilizes the best available equipment (Amplitrex AT1000) to test and match audio tubes. We do not sell untested tubes - never have and never will. Only the best high testing NOS tubes are selected for Riverstone's Platinum tested/matched pairs. Fewer than 50% of the NOS tubes we test meet our standards for high fidelity audio use and are considered for use in our Platinum Grade tube sets. EXPERIENCED ENGINEERS match vacuum tubes for BOTH plate current and mutual conductance. Test results are clearly listed on each tube box. All tubes we sell must also pass a specialized life test and an audio sound test. We guarantee that the GE 5654W tubes selected for these matched pairs test at NOS levels at or above 5000 micro-mho and a plate current of 7.2 mA or higher. ***Vacuum tubes sold by Riverstone Audio will have the "Riverstone Audio" name, logo and QC label on the boxes***