... tone control system, which is versatile for all style GF-30 Guitar vintage amplifier have solid amp body, 3-band EQ ... even output your signal to PA system for amplifying!SpecificationOutput: 30 watts into 8 ohmsControls: Gain, Drive Switch, Treble, Middle,Bass ... .5*24.5*42G.W./Ctn (Kgs):13.1KG GF-30 Guitar vintage amplifier