R8 KT88/EL34 x4 Tube Integrated AMP Power Amplifier Headphone Silver. One amplifier can used wiht tube EL34, KT88 or 6550, so, you can get 3 kinds of sound from different models tubes. The default matching tubes of this machine is KT88. T is a Red selection button on the Back of the amp to switch.Pure hand-made, Point to point manual welding. R8 is an integrated Amplifier, it is a Power Amplifier too (t is a group Power amp input), it is a Headphones amp too. Triode and ultra-linear selection are available which can be switched by the button on the amplifier. When the indicator light is Green, it is triode working. When the indicator light is Red, it is ultra-linear working. With a remote control, Vacuum tube protective cover, Fuse and an English manual. As our valued customer, we will do our best to make sure the product you receive arrives to you on time and as expected. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "yellow_yt" and is located in this country: US. This item can be shipped to United States.