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 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 you not hear while more complex music. For replace 7-pin 6AK5/6AK5W/6Zh1P/6J1/6J1P tubes. for using to replace the vacuum tubes used in P1, P2, P3, T20, BOX X2. better sound . Colour:transparent Material:Glass + Electronic Accessories Size:45 x 18mm Package Contents: 2 x JAN-5654W Vacuum Tube Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.