The 5654W is a brand new tube. The sound is all-round soft, delicate, and noisy. The tubes are precisely matched.Substitute for 7-pin 6AK5/6AK5W/6Zh1P/6J1/6J1P tubes. It can also directly replace WE-403A/403B/EF95 and ordinary 5654. In addition, it can upgrade the sound of 6J2/6J3/6J4/6J5.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 6AK5/6AK5W/6Zh1P/6J1/6J1P 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 + 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.