Lee Custom amplifier 12AX7BB. This size is very convenient as a tube buffer. It can be used as a buffer for your effects board, as a distortion effect, or to reduce the simulated sound of multi-effects units. Furthermore, since you can change the phase, it's very useful if your guitar is out of phase or if the phase is reversed by connecting some effects in your board. Recommended for those who want a slightly different sound with a 12AU7. I've used several tube-equipped units, and this one has very low noise. Includes the main unit, box, and instruction manual. Operation confirmed. There are scratches and dirt due to use, so please understand that this is a used item.