Usage Tips:Features:Each package contains a fully tested andmatched pair of US-made JAN5654W vacuum tubes militaries standard.Replacement of 7 diode 6 ak5/6 ak5w/zh1p/j1p j1/6. You can also replace WE-403A/403B/EF95 tubes and regular 5654 tubes directly.Note: Replacing the wrong tube type may damage the amplifier. If you are not sure whether this 5645W can be used as an audios device replacement, please contact the manufacturer of the amplifier.Its sound is fuller and widers. The high notes are softer and the low notes are tighter. You can hear details in more complex music that you have never heard before.Unleash the power of your audios devices with this 5654W Vacuum Tubes. Elevates your listen pleasure and indulge in the richness of every musical note. Upgrades your audios setups today for better performances.Specifications:Material: plasticLength: approx 4.5cm/1.77inchNote:Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid,Due to the difference between different monitors, the picture may not reflect the actual color of the item.Package includes:2xVacuum Tubes