Ampeg GVT Series GVT52-112 50-Watt 2-Channel 1x12 Guitar Combo Amplifier Dual power modes; Full power - 50 watts RMS; Half power - 25 watts RMS Dual channels with foot switchable gain boost; Ch. 1 - low to moderate gain; Ch. 2 - moderate to high gain Preamp: Tube ( 3 x 12AX7 ) Rectifier: Solid state Power amp: Tube ( 2 x 6L6GC )