Hartke GT100C Guitar Amplifier GH Series The new Hartke combos come in two versions combining specially designed cabinets and speakers with the new Hartke 2-channel, tube-pre amp sections.The GT100c features the 100-Watt amp section driving two 12-inch speakers speciallydesigned for high output and serious volume, while providing killer tone. Features: GT100c 100 Watt 2-Channel Guitar Combo with 2 x 12 speakers 12-AX7 Tube Pre-Amp Section with Independent Channel Gain Bass, Mid (channel 2 only) and Treble Controls for each channel Built in Spring Reverb and Effects Loop Send/Return Jacks ¼-inch Stereo TRS CD Input Jack; ¼-inch Headphone Jack Jack for channel selection footswitch