Hartke GT100 Guitar Amplifier GH Series With 100-Watts of power behind a 2-channel tube pre-amp, users get power to spare. The GT100 features a classic 12-AX7 tube pre-amp section with independent channel gain controls, bass and treble controls for channel 1, bass, mid and treble controls for channel 2. Variable spring reverb, effects send and return jacks, ¼-inch headphone jack, and a rear panel footswitch jack. Professional features and classic internal circuitry make the GT100 a serious performer. Features 100 Watt 2-Channel Guitar Amp 12-AX7 Tube Pre-Amp Section with Independent Channel Gain Bass, Mid (channel 2 only) and Treble Controls for each channel Variable Spring Reverb and Effects Send/Return Jacks ¼-inch Headphone Jack Jack for channel selection footswitch