The 5654W is a tube. The sound is all-round soft, delicate, and noisy. The tubes are precisely matched.Substitute for 7-pin 6AK5 or 6AK5W or 6Zh1P or 6J1 or 6J1P tubes. It can also directly replace WE-403A or 403B or EF95 and ordinary 5654. In addition, it can upgrade the sound of 6J2 or 6J3 or 6J4 or 6J5.Note:Replacing the wrong type of tube may damage your amplifier. If you are not this 5645W can be used as a replacement for your audio device, please check with your amplifier manufacturer.It has a fuller, wider sound stage. The treble is smoother and is a little bit tighter. And you can hear some details that you did not hear before while more complex music.For replace 7-pin 6AK5 or 6AK5W or 6Zh1P or 6J1 or 6J1P tubes.Best for using to replace the vacuum tubes used in our P1, P2, P3, T20, BOX X2. Get better sound quality.Colour:transparentMaterial:Glass and Electronic AccessoriesSize:45 x 18mmPackage Contents:2 x JAN-5654W Vacuum TubeOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.