This is a modification kit that modifies the current TS-9 to TS-808 specifications. By replacing the parts in this kit, the midrange of the TS-9 will change to a mild and glossy sound.It works well for both single coils and humbuckers. The distortion turns into a typical booster overdrive with a calmer gain than an increase. It also improves sound loss. The point is the dense midrange, and the luster of the sound when played at full is exactly the TS-808. By installing this kit is the completion of the Tube Screamer 808. Please give it a try. Comes with a 4-page easy-to-understand work manual in color. It is a kit that even beginners can work with relatively easily. Since the op amp is installed via a socket, the op amp can be replaced after modification. Modify your TS-9 with your own hands.